Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756113Ab3JKRzD (ORCPT ); Fri, 11 Oct 2013 13:55:03 -0400 Received: from mail-ee0-f43.google.com ([74.125.83.43]:60747 "EHLO mail-ee0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754774Ab3JKRy7 (ORCPT ); Fri, 11 Oct 2013 13:54:59 -0400 MIME-Version: 1.0 In-Reply-To: References: Date: Fri, 11 Oct 2013 10:54:58 -0700 X-Google-Sender-Auth: 6yHuBahiNB8ArwyR5_ldq16Ywvo Message-ID: Subject: Re: [git pull] drm fixes From: Linus Torvalds To: Dave Airlie Cc: DRI mailing list , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1564 Lines: 29 On Thu, Oct 10, 2013 at 10:28 PM, Dave Airlie wrote: > > and one pain in the ass revert, so we have VGA arbitration that when > implemented 4-5 years ago really hoped that GPUs could remove themselves > from arbitration completely once they had a kernel driver, it seems Intel > hw designers decided that was too nice a facility to allow us to have so > they removed it when they went on-die (so since Ironlake at least), now > Alex Williamson added support for VGA arbitration for newer GPUs however > this now exposes itself to userspace as requireing arbitration of GPU VGA > regions and the X server gets involved and disables things that it can't > handle when VGA access is possibly required around every operation, so in > order to break userspace we just reverted things back to the old known > broken status so maybe we can try and design out way out. Ville also had a > patch to use stop machine for the two times Intel needs to access VGA > space, that might be acceptable with some rework, but for now myself and > Daniel agreed to just go back. Your explanation messages tend to channel James Joyce. They may be literary works of art, but it _does_ occasionally make them somewhat hard to read. I have tried to turn them into slightly less stream-of-consciousness. Linus -- 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/