Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 5 Mar 2001 18:21:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 5 Mar 2001 18:21:19 -0500 Received: from f00f.stub.clear.net.nz ([203.167.224.51]:25103 "HELO metastasis.f00f.org") by vger.kernel.org with SMTP id ; Mon, 5 Mar 2001 18:21:07 -0500 Date: Tue, 6 Mar 2001 12:21:04 +1300 From: Chris Wedgwood To: "David S. Miller" Cc: Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, linuxppc-dev@lists.linuxppc.org Subject: Re: The IO problem on multiple PCI busses Message-ID: <20010306122104.B26306@metastasis.f00f.org> In-Reply-To: <19350124090521.18330@mailhost.mipsys.com> <15006.40524.929644.25622@pizda.ninka.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <15006.40524.929644.25622@pizda.ninka.net>; from davem@redhat.com on Thu, Mar 01, 2001 at 11:09:00AM -0800 X-No-Archive: Yes Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 01, 2001 at 11:09:00AM -0800, David S. Miller wrote: I think a cleaner scheme is to allow mmap() on /proc/bus/pci/${BUS}/${DEVICE} nodes, that is much cleaner and solves transparently any "different word size between userland and kernel" issues (specifically 32-bit userlands executing on 64-bit kernels). This works great for when you want to do IO cycles from userland; but what about the case of hardware which requires IO cycles from a device driver for some very non-video hardware that may support multiple cards across multiple busses? Or do I not understand? --cw - 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/