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    SubjectRE: [PATCH 05/18] ioat2+: add fence support
    Williams, Dan J wrote:
    > In preparation for adding more operation types to the ioat3 path the
    > driver needs to honor the DMA_PREP_FENCE flag. For example the async_tx api
    > will hand xor->memcpy->xor chains to the driver with the 'fence' flag set on
    > the first xor and the memcpy operation. This flag in turn sets the 'fence'
    > flag in the descriptor control field telling the hardware that future
    > descriptors in the chain depend on the result of the current descriptor, so
    > wait for all writes to complete before starting the next operation.
    >
    > Note that ioat1 does not prefetch the descriptor chain, so does not
    > require/support fenced operations.
    >
    > Signed-off-by: Dan Williams <dan.j.williams@intel.com>
    > ---

    Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>

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