From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 17 May 2002 07:17:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 17 May 2002 07:17:48 -0400 Received: from pizda.ninka.net ([216.101.162.242]:28827 "EHLO pizda.ninka.net") by vger.kernel.org with ESMTP id ; Fri, 17 May 2002 07:17:45 -0400 Date: Fri, 17 May 2002 04:04:21 -0700 (PDT) Message-Id: <20020517.040421.38226563.davem@redhat.com> To: ink@jurassic.park.msu.ru Cc: jgarzik@mandrakesoft.com, andrew.grover@intel.com, mochel@osdl.org, Greg@kroah.com, linux-kernel@vger.kernel.org Subject: Re: pci segments/domains From: "David S. Miller" In-Reply-To: <20020517151154.B16767@jurassic.park.msu.ru> X-Mailer: Mew version 2.1 on Emacs 21.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Ivan Kokshaysky Date: Fri, 17 May 2002 15:11:54 +0400 Hmm, not sure. I think it's impossible at least on alpha. In either case I don't see how "struct pci_domain" etc. could help in this case. Probably you'll need some mapping function with pdev1, pdev2 as arguments... I'm not saying pci_domain structure will help, I am only saying that domain number is not the way to figure out the ability to do DMA between two devices :-) I know for a fact that you can do PCI-to-PCI DMA between two PCI domains on Alpha.