linux-kernel - Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager

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Message-ID: <4C3BFDD3.8040209@codeaurora.org>
Date:	Mon, 12 Jul 2010 22:46:59 -0700
From:	Zach Pfeffer <zpfeffer@...eaurora.org>
To:	Joerg Roedel <joro@...tes.org>
CC:	Daniel Walker <dwalker@...eaurora.org>,
	Andi Kleen <andi@...stfloor.org>,
	Randy Dunlap <randy.dunlap@...cle.com>, mel@....ul.ie,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 3/3] mm: iommu: The Virtual Contiguous Memory Manager

Joerg Roedel wrote:
> On Fri, Jul 02, 2010 at 12:33:51AM -0700, Zach Pfeffer wrote:
>> Daniel Walker wrote:
> 
>>> So if we include this code which "map implementations" could you
>>> collapse into this implementations ? Generally , what currently existing
>>> code can VCMM help to eliminate?
>> In theory, it can eliminate all code the interoperates between IOMMU,
>> CPU and non-IOMMU based devices and all the mapping code, alignment,
>> mapping attribute and special block size support that's been
>> implemented.
> 
> Thats a very abstract statement. Can you point to particular code files
> and give a rough sketch how it could be improved using VCMM?

I can. Not to single out a particular subsystem, but the video4linux
code contains interoperation code to abstract the difference between
sg buffers, vmalloc buffers and physically contiguous buffers. The
VCMM is an attempt to provide a framework where these and all the
other buffer types can be unified.

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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