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    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.


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      Last update: 2007-08-24 20:07    [W:0.028 / U:4.036 seconds]
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