Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932157AbaFZQLJ (ORCPT ); Thu, 26 Jun 2014 12:11:09 -0400 Received: from gw-1.arm.linux.org.uk ([78.32.30.217]:44185 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751759AbaFZQLH (ORCPT ); Thu, 26 Jun 2014 12:11:07 -0400 Date: Thu, 26 Jun 2014 17:10:55 +0100 From: Russell King - ARM Linux To: Alexandre Courbot Cc: =?iso-8859-1?Q?St=E9phane?= Marchesin , Lucas Stach , Maarten Lankhorst , "nouveau@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , "dri-devel@lists.freedesktop.org" , Ben Skeggs , "linux-tegra@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [Nouveau] [PATCH v2 2/3] drm/ttm: introduce dma cache sync helpers Message-ID: <20140626161055.GX32514@n2100.arm.linux.org.uk> References: <1403603667-11302-1-git-send-email-acourbot@nvidia.com> <1403603667-11302-3-git-send-email-acourbot@nvidia.com> <20140624100220.GK32514@n2100.arm.linux.org.uk> <53A953E6.2030503@nvidia.com> <53A95910.20104@nvidia.com> <53A96EC5.3030701@canonical.com> <1403616338.4230.8.camel@weser.hi.pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 26, 2014 at 11:53:20PM +0900, Alexandre Courbot wrote: > We don't plan to rely on CMA for too long. IOMMU support is on the way > and should make our life easier, although no matter the source of > memory, we will still have the issue of the lowmem mappings. When it comes to DMA memory, talking about lowmem vs highmem is utterly meaningless. The lowmem/highmem split is entirely a software concept and is completely adjustable. An extreme example is that you can boot any platform with more than 32MB of memory with 32MB of lowmem and the remainder as highmem. -- FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly improving, and getting towards what was expected from it. -- 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/