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Given a PCI device with multiple functions in a DDW capable slot, the following situation can be encountered: When the first function sets a 64-bit DMA mask, enable_ddw() will be called and we can fail to properly configure DDW (the most common reason being the new DMA window's size is not large enough to map all of an LPAR's memory). With the recent changes to DDW, we remove the base window in order to determine if the new window is of sufficient size to cover an LPAR's memory. We correctly replace the base window if we find that not to be the case. However, once we go through and re-configured 32-bit DMA via the IOMMU, the next function of the adapter will go through the same process. And since DDW is a characteristic of the slot itself, we are most likely going to fail again. But to determine we are going to fail the second slot, we again remove the base window -- but that is now in-use by the first function/driver, which might be issuing I/O already. To close this window, keep a list of all the failed struct device_nodes that have failed to configure DDW. If the current device_node is in that list, just fail out immediately and fall back to 32-bit DMA without doing any DDW manipulation. Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> |
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