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From: akepner@sgi.com
To: Michael Ellerman <michael@ellerman.id.au>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Grant Grundler <grundler@parisc-linux.org>,
	Tony Luck <tony.luck@intel.com>,
	Jesse Barnes <jbarnes@virtuousgeek.org>,
	Jes Sorensen <jes@sgi.com>,
	Randy Dunlap <randy.dunlap@oracle.com>,
	Roland Dreier <rdreier@cisco.com>,
	David Miller <davem@davemloft.net>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	linux-kernel@vger.kernel.org, Mark Nelson <mdnelson@au1.ibm.com>
Subject: Re: [PATCH 1/3 v3] dma: document dma_{un}map_{single|sg}_attrs() interface
Date: Wed, 19 Mar 2008 17:32:58 -0700	[thread overview]
Message-ID: <20080320003258.GM1843@sgi.com> (raw)
In-Reply-To: <1205469029.7414.18.camel@concordia.ozlabs.ibm.com>

On Fri, Mar 14, 2008 at 03:30:29PM +1100, Michael Ellerman wrote:
> 
> I like this better, sorry to keep nitpicking, but just a few comments
> below ..

Comments are appreciated.

> ...
> You say a "DMA to a memory region with the DMA_ATTR_BARRIER attribute
> forces all pending DMA writes to complete". Does it force _all_ DMA
> writes to complete, or just writes to the region, or just writes coming
> from devices? What if something is writing to a device?
>

Yes, forces all writes to complete (as others have already said).

 
> Does DMA_ATTR_BARRIER have any effect on reads?
> 

No, changed the name to DMA_ATTR_WRITE_BARRIER to emphasize this.

-- 
Arthur


  parent reply	other threads:[~2008-03-20  0:42 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-28  3:24 akepner
2008-02-29  2:45 ` Michael Ellerman
2008-02-29 18:25   ` Grant Grundler
2008-02-29 18:37     ` James Bottomley
2008-03-01  2:56       ` Benjamin Herrenschmidt
2008-03-01  3:11         ` Jesse Barnes
2008-03-01  7:18         ` Grant Grundler
2008-03-05 18:13       ` akepner
2008-03-05 19:02         ` Jesse Barnes
2008-03-06  6:01         ` Michael Ellerman
2008-03-12  1:19           ` akepner
2008-03-14  4:13             ` Grant Grundler
2008-03-14  4:30             ` Michael Ellerman
2008-03-14  5:21               ` Grant Grundler
2008-03-14 16:40                 ` Jesse Barnes
2008-03-18  1:08                 ` Michael Ellerman
2008-03-20  0:32               ` akepner [this message]
2008-02-29 21:23   ` akepner

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