From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from moutng.kundenserver.de ([212.227.126.186]:50177 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750876Ab0G1IkV convert rfc822-to-8bit (ORCPT ); Wed, 28 Jul 2010 04:40:21 -0400 From: Arnd Bergmann Subject: Re: [PATCH 1/2] arm: msm: Add System MMU support. Date: Wed, 28 Jul 2010 10:39:44 +0200 References: <1280270466-13503-1-git-send-email-stepanm@codeaurora.org> In-Reply-To: <1280270466-13503-1-git-send-email-stepanm@codeaurora.org> MIME-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Message-Id: <201007281039.44883.arnd@arndb.de> Sender: linux-arm-msm-owner@vger.kernel.org List-ID: To: Stepan Moskovchenko Cc: dwalker@codeaurora.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org On Wednesday 28 July 2010 00:41:06 Stepan Moskovchenko wrote: > > Add support for the System MMUs found on the 8x60 and 8x72 > families of Qualcomm chips. These SMMUs allow virtualization > of the address space used by most of the multimedia cores > on these chips. > How is this different from an IOMMU? >>From a very brief look, it seems that you should be using the existing dma-mapping APIs here instead of making up your own. Arnd From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Wed, 28 Jul 2010 10:39:44 +0200 Subject: [PATCH 1/2] arm: msm: Add System MMU support. In-Reply-To: <1280270466-13503-1-git-send-email-stepanm@codeaurora.org> References: <1280270466-13503-1-git-send-email-stepanm@codeaurora.org> Message-ID: <201007281039.44883.arnd@arndb.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday 28 July 2010 00:41:06 Stepan Moskovchenko wrote: > > Add support for the System MMUs found on the 8x60 and 8x72 > families of Qualcomm chips. These SMMUs allow virtualization > of the address space used by most of the multimedia cores > on these chips. > How is this different from an IOMMU? >>From a very brief look, it seems that you should be using the existing dma-mapping APIs here instead of making up your own. Arnd