From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with SMTP id 219B16B0012 for ; Wed, 15 Jun 2011 07:20:52 -0400 (EDT) From: Arnd Bergmann Subject: Re: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory Allocator added Date: Wed, 15 Jun 2011 13:20:42 +0200 References: <1307699698-29369-1-git-send-email-m.szyprowski@samsung.com> <201106142242.25157.arnd@arndb.de> In-Reply-To: MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <201106151320.42182.arnd@arndb.de> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Nazarewicz Cc: Zach Pfeffer , Daniel Stone , Ankita Garg , Daniel Walker , Jesse Barker , Mel Gorman , linux-kernel@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, Kyungmin Park , KAMEZAWA Hiroyuki , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org On Wednesday 15 June 2011, Michal Nazarewicz wrote: > On Tue, 14 Jun 2011 22:42:24 +0200, Arnd Bergmann wrote: > > * We still need to solve the same problem in case of IOMMU mappings > > at some point, even if today's hardware doesn't have this combination. > > It would be good to use the same solution for both. > > I don't think I follow. What does IOMMU has to do with CMA? The point is that on the higher level device drivers, we want to hide the presence of CMA and/or IOMMU behind the dma mapping API, but the device drivers do need to know about the bank properties. If we want to solve the problem of allocating per-bank memory inside of CMA, we also need to solve it inside of the IOMMU code, using the same device driver interface. Arnd -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org