Date: Thu, 22 Jul 2010 08:39:17 +0100
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Zach Pfeffer <zpfeffer@codeaurora.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>, ebiederm@xmission.com,
        linux-arch@vger.kernel.org, dwalker@codeaurora.org, mel@csn.ul.ie,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, andi@firstfloor.org, linux-omap@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device
	memory management
Message-ID: <20100722073917.GC6802@n2100.arm.linux.org.uk>
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>
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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.
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