From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752128Ab1AWUxM (ORCPT ); Sun, 23 Jan 2011 15:53:12 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:43764 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751095Ab1AWUxL (ORCPT ); Sun, 23 Jan 2011 15:53:11 -0500 From: "Rafael J. Wysocki" To: Chris Wilson Subject: Re: [PATCH 1/1] Use cachable mapping for i915 opregion. Date: Sun, 23 Jan 2011 21:52:27 +0100 User-Agent: KMail/1.13.5 (Linux/2.6.38-rc1+; KDE/4.4.4; x86_64; ; ) Cc: Michael Karcher , airlied@linux.ie, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <1295803414-5373-1-git-send-email-kernel@mkarcher.dialup.fu-berlin.de> <0d30dc$kr9u7e@orsmga001.jf.intel.com> In-Reply-To: <0d30dc$kr9u7e@orsmga001.jf.intel.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit Message-Id: <201101232152.27970.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sunday, January 23, 2011, Chris Wilson wrote: > On Sun, 23 Jan 2011 18:23:34 +0100, Michael Karcher wrote: > > The opregion is a shared memory region between ACPI and the graphics > > driver. As the ACPI mapping has been changed to cachable in commit > > 6d5bbf00d251cc73223a71422d69e069dc2e0b8d, mapping the intel opregion > > non-cachable now fails. As no bus-master hardware is involved in the > > opregion, cachable map should do no harm. > > Satisfied myself that is indeed equivalent to use the newly introduced > acpi_os_ioremap for this purpose and applied to -fixes. However, it might be better to use acpi_os_ioremap() in case we decide to go back to ioremap() for some reason. For now, ioremap_cache() seems fine, but ... Thanks, Rafael