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

[akepner@sgi.com]

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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