linux-kernel - Re: [PATCH 1/3 v3] dma: document dma_{un}map_{single|sg}

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Message-ID: <20080305181307.GR17802@sgi.com>
Date:	Wed, 5 Mar 2008 10:13:07 -0800
From:	akepner@....com
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Grant Grundler <grundler@...isc-linux.org>,
	Michael Ellerman <michael@...erman.id.au>,
	Tony Luck <tony.luck@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jes Sorensen <jes@....com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Roland Dreier <rdreier@...co.com>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3 v3] dma: document dma_{un}map_{single|sg}_attrs() interface

On Fri, Feb 29, 2008 at 12:37:56PM -0600, James Bottomley wrote:
> ....
> To be honest, I still don't like the name.  SYNC_ON_WRITE is the SN2
> implementation.  What it's actually doing is implementing strict
> ordering semantics.  I think it should really be
> DMA_ATTR_STRICT_ORDERING (with a corresponding
> DMA_ATTR_RELAXED_ORDERING)....

I've been thinking about a new name, but don't like 
DMA_ATTR_STRICT_ORDERING. 

What I'm trying to do is to establish order (across 
a NUMA fabric) of DMA to different memory regions, i.e., 
DMA to memory region A forces all outstanding DMA (to 
memory regions B, C,....) to complete first.

DMA_ATTR_STRICT_ORDERING sounds like a PCI thing to me, 
and this is a NUMA interconnect thing.

-- 
Arthur

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