From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from over.ny.us.ibm.com (over.ny.us.ibm.com [32.97.182.150]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "over.ny.us.ibm.com", Issuer "Equifax" (verified OK)) by ozlabs.org (Postfix) with ESMTP id CB8B5679E6 for ; Sun, 16 Apr 2006 00:34:38 +1000 (EST) Received: from e33.co.us.ibm.com (e33.boulder.ibm.com [9.17.249.43]) by pokfb.esmtp.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id k3FDYGlF016881 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Sat, 15 Apr 2006 09:34:17 -0400 Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e33.co.us.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id k3FDY2xC002564 for ; Sat, 15 Apr 2006 09:34:02 -0400 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by westrelay02.boulder.ibm.com (8.12.10/NCO/VER6.8) with ESMTP id k3FDUTTk248524 for ; Sat, 15 Apr 2006 07:30:29 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.12.11/8.13.3) with ESMTP id k3FDY2ua026962 for ; Sat, 15 Apr 2006 07:34:02 -0600 Date: Sat, 15 Apr 2006 08:37:52 -0500 From: Jon Mason To: Benjamin Herrenschmidt 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 In-Reply-To: <1145048275.4223.32.camel@localhost.localdomain> Cc: Olof Johansson , linuxppc-dev@ozlabs.org, paulus@samba.org, linux-kernel@vger.kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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