From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755633AbZHKXVJ (ORCPT ); Tue, 11 Aug 2009 19:21:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755562AbZHKXVI (ORCPT ); Tue, 11 Aug 2009 19:21:08 -0400 Received: from outbound-mail-39.bluehost.com ([69.89.20.193]:34680 "HELO outbound-mail-39.bluehost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755553AbZHKXVH (ORCPT ); Tue, 11 Aug 2009 19:21:07 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=virtuousgeek.org; h=Received:Date:From:Cc:Subject:Message-ID:In-Reply-To:References:X-Mailer:Mime-Version:Content-Type:Content-Transfer-Encoding:X-Identified-User; b=TOxp36R+XaAKpOP3NLN+wuoLubzV5ivuyFzhVNZjcvVnQjJZ9igcyqw7kCRJy94PQWw42bv6Wad5k5nwiZKvav1wJ9l23S0hvqKS3PgOxsqulaQUri5MgrZ2p5TMlfU8; Date: Tue, 11 Aug 2009 16:21:03 -0700 From: Jesse Barnes Cc: Dave Airlie , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, dri-devel@lists.sf.net, Tiago Vignatti Subject: Re: [PATCH] vga: implements VGA arbitration on Linux Message-ID: <20090811162103.1b2a65c9@jbarnes-g45> In-Reply-To: <20090811161746.7b8878aa@jbarnes-g45> References: <1249969927-884-1-git-send-email-airlied@gmail.com> <20090811161746.7b8878aa@jbarnes-g45> X-Mailer: Claws Mail 3.7.2 (GTK+ 2.17.5; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Identified-User: {10642:box514.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 75.111.28.251 authed with jbarnes@virtuousgeek.org} To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 11 Aug 2009 16:17:46 -0700 Jesse Barnes wrote: > On Tue, 11 Aug 2009 15:52:06 +1000 > Dave Airlie wrote: > > > From: Tiago Vignatti > > > > Background: > > Graphic devices are accessed through ranges in I/O or memory space. > > While most modern devices allow relocation of such ranges, some > > "Legacy" VGA devices implemented on PCI will typically have the same > > "hard-decoded" addresses as they did on ISA. For more details see > > "PCI Bus Binding to IEEE Std 1275-1994 Standard for Boot > > (Initialization Configuration) Firmware Revision 2.1" Section 7, > > Legacy Devices. > > > > The Resource Access Control (RAC) module inside the X server > > currently does the task of arbitration when more than one legacy > > device co-exists on the same machine. But the problem happens when > > these devices are trying to be accessed by different userspace > > clients (e.g. two server in parallel). Their address assignments > > conflict. Therefore an arbitration scheme _outside_ of the X server > > is needed to control the sharing of these resources. This document > > introduces the operation of the VGA arbiter implemented for Linux > > kernel. > > > > Signed-off-by: Tiago Vignatti > > Signed-off-by: Dave Airlie > > Ok, applied this to my linux-next branch, but I'd like to get Ben's > s-o-b before pushing it to Linus. Oh yeah, and we should get the documentation merged too. I can handle that or you can send it to Randy. Tiago? -- Jesse Barnes, Intel Open Source Technology Center