Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758442Ab1D2Lz1 (ORCPT ); Fri, 29 Apr 2011 07:55:27 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:49819 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755884Ab1D2LzW (ORCPT ); Fri, 29 Apr 2011 07:55:22 -0400 Date: Fri, 29 Apr 2011 12:56:13 +0100 From: Alan Cox To: Arnd Bergmann Cc: Benjamin Herrenschmidt , "Russell King - ARM Linux" , linaro-mm-sig@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [RFC] ARM DMA mapping TODO, v1 Message-ID: <20110429125613.616f977b@lxorguk.ukuu.org.uk> In-Reply-To: <201104291326.25634.arnd@arndb.de> References: <201104212129.17013.arnd@arndb.de> <20110428093039.GU17290@n2100.arm.linux.org.uk> <1304024836.2513.198.camel@pasglop> <201104291326.25634.arnd@arndb.de> X-Mailer: Claws Mail 3.7.8 (GTK+ 2.22.0; x86_64-redhat-linux-gnu) Face: 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 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 Content-Length: 712 Lines: 14 > I believe that the PC graphics cards that have noncoherent DMA mappings > are all of the unified memory (integrated into the northbridge) kind, > so they are not on the same host bridge as all regular PCI devices, > even if they appear as a PCI device. The AGP GART is not coherent on a lot of systems - not necessarily unified memory though, it can be a plug in AGP card too. The GART is basically an IOMMU (and indeed in the later AMD case used exactly as that) -- 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/