linux-kernel - Re: [RFC] dma: passing "attributes" to dma_map

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Message-ID: <20071221180022.GW412@sgi.com>
Date:	Fri, 21 Dec 2007 10:00:22 -0800
From:	akepner@....com
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	grundler@...isc-linux.org, jbarnes@...tuousgeek.org, jes@....com,
	randy.dunlap@...cle.com, rdreier@...co.com,
	James.Bottomley@...eleye.com, davem@...emloft.net,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] dma: passing "attributes" to dma_map_* routines

On Fri, Dec 21, 2007 at 07:56:25AM +1100, Benjamin Herrenschmidt wrote:
> ...
> Can't you just have a primitive to sync things up that you call
> explicitely from your driver after fetching a new status entry ?
> 

Well, the only mechanisms I know to get things synced are the ones 
I mentioned before: 1) generate an interrupt, 2) write to memory 
which has the "barrier" attribute. Obviously 1 is out - giving  
the memory used for status indications the barrier attribute is 
the most primitive means I'm aware of.

-- 
Arthur

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