This patch disables DMA refetch in the PCI bridge. We have disabled DMA
prefetch for quite some time. Testing with XEN revealed another ASIC bug. If
dom0 resides on a P600 the board can can an MCA bi accessing invalid memory
addresses. Apparently, we need to disable both prefetch and refetch.
My understanding is a refetch operation should not occur but it is a valid
thing to do if prefetched data is no longer available for whatever reason.
Please consider this patch for inclusion.
Signed-off-by: NMike Miller <mike.miller@hp.com>
Signed-off-by: NAlex Chiang <achiang@hp.com>

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Signed-off-by: NJens Axboe <jens.axboe@oracle.com>