tree c9bcd5e09766ffb9ca043cea110a9e0ae5e735d7
parent 17b9f9e2653a2eae3b7e1bb8a1f7f80f6edc3fe3
author Nishanth Aravamudan <nacc@us.ibm.com> 1299166862 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1299813504 +1100

powerpc/pseries: Disable MSI using new interface if possible

On upcoming hardware, we have a PCI adapter with two functions, one of
which uses MSI and the other uses MSI-X. This adapter, when MSI is
disabled using the "old" firmware interface (RTAS_CHANGE_FN), still
signals an MSI-X interrupt and triggers an EEH. We are working with the
vendor to ensure that the hardware is not at fault, but if we use the
"new" interface (RTAS_CHANGE_MSI_FN) to disable MSI, we also
automatically disable MSI-X and the adapter does not appear to signal
any stray MSI-X interrupt.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Acked-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>