linux-kernel - [PATCH 0/3] pci: let devices flush DMA to host memory

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Date:	Fri, 24 Aug 2007 11:02:32 -0700
From:	akepner@....com
To:	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz
Cc:	gregkh@...e.de,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jes Sorensen <jes@....com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	David Miller <davem@...emloft.net>
Subject: [PATCH 0/3] pci: let devices flush DMA to host memory

On Altix, DMA may be reordered within the NUMA interconnect. 
This can be a problem with Infiniband, where DMA to Completion 
Queues can race with data DMA. This patchset allows a driver 
to associate a memory region with a "dmaflush" attribute, so 
that writes to the memory region flush in-flight DMA, preventing 
the CQ/data race.

There are three patches in this set:

	[1/3]: add pci_dma_flags_set_dmaflush() to pci interface
	[2/3]: redefine pci_dma_flags_set_dmaflush() for sn-ia64
	[3/3]: document pci_dma_flags_set_dmaflush()

And there would be additional patches to IB drivers to make use 
of the interface, of course. 

-- 
Arthur

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