From mboxrd@z Thu Jan  1 00:00:00 1970
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
Date: Thu, 22 Jul 2010 08:39:17 +0100
Subject: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device
	memory management
In-Reply-To: <20100722043034.GC22559@codeaurora.org>
References: <20100715014148.GC2239@codeaurora.org>
	<20100719082213.GA7421@n2100.arm.linux.org.uk>
	<20100720221959.GC12250@codeaurora.org>
	<20100721104356S.fujita.tomonori@lab.ntt.co.jp>
	<20100722043034.GC22559@codeaurora.org>
Message-ID: <20100722073917.GC6802@n2100.arm.linux.org.uk>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Wed, Jul 21, 2010 at 09:30:34PM -0700, Zach Pfeffer wrote:
> This goes to the nub of the issue. We need a lot of 1 MB physically
> contiguous chunks. The system is going to fragment and we'll never get
> our 12 1 MB chunks that we'll need, since the DMA API allocator uses
> the system pool it will never succeed.

By the "DMA API allocator" I assume you mean the coherent DMA interface,
The DMA coherent API and DMA streaming APIs are two separate sub-interfaces
of the DMA API and are not dependent on each other.