Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754640Ab0GaCbn (ORCPT ); Fri, 30 Jul 2010 22:31:43 -0400 Received: from gate.crashing.org ([63.228.1.57]:35396 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754477Ab0GaCbl (ORCPT ); Fri, 30 Jul 2010 22:31:41 -0400 Subject: Re: [PATCH 1/2] arm: msm: Add System MMU support. From: Benjamin Herrenschmidt To: FUJITA Tomonori Cc: stepanm@codeaurora.org, arnd@arndb.de, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, dwalker@codeaurora.org, linux-kernel@vger.kernel.org In-Reply-To: <20100729123512Y.fujita.tomonori@lab.ntt.co.jp> References: <201007281950.20847.arnd@arndb.de> <20100729123512Y.fujita.tomonori@lab.ntt.co.jp> Content-Type: text/plain; charset="UTF-8" Date: Sat, 31 Jul 2010 12:30:49 +1000 Message-ID: <1280543449.1902.29.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 765 Lines: 24 On Thu, 2010-07-29 at 12:35 +0900, FUJITA Tomonori wrote: > Don't confuse the IOMMU interface with the DMA API that Arnd > mentioned. > > They are not related at all. > > The DMA API is defined in Documentation/DMA-API.txt. > > Arnd told you that include/asm-generic/dma-mapping-common.h is the > library to support the DMA API with multiple IOMMUs. Lots of > architectures (x86, powerpc, sh, alpha, ia64, microblaze, sparc) > use it. Also, some of the iommu layer actually originates from powerpc. Cheers, Ben. -- 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/