From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753343AbYJFNs4 (ORCPT ); Mon, 6 Oct 2008 09:48:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751427AbYJFNss (ORCPT ); Mon, 6 Oct 2008 09:48:48 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:45016 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751244AbYJFNss (ORCPT ); Mon, 6 Oct 2008 09:48:48 -0400 Date: Mon, 6 Oct 2008 14:48:35 +0100 From: Alan Cox To: Maxim Levitsky Cc: Arjan van de Ven , linux-kernel@vger.kernel.org Subject: Re: RFC: banning device driver reserved resources from /dev/mem Message-ID: <20081006144835.6e58f73a@lxorguk.ukuu.org.uk> In-Reply-To: <48EA1540.8060409@gmail.com> References: <20081005180154.7cc12486@infradead.org> <20081006102739.16d1a434@lxorguk.ukuu.org.uk> <48EA1540.8060409@gmail.com> X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.12; x86_64-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > I think the proper solution is to make /dev/mem pure diagnostic tool. > Drivers should use /sys mappings of pci devices to access their iomem Only a tiny fraction of devices in the world are PCI, and those platforms where you most what /dev/mem type debugging tools are often those without PCI > , or even better they should not touch pci mappings > directly at all, but talk to kernel, and if xorg needs access > to video memory it should talk to drm and get its mapping from there. Most video cards don't use DRM, but the kernel does have the same video memory mapped for text consoles. Alan