powerpc/pseries/eeh: Handle RTAS delay requests in configure_bridge

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commit 871e178e0f upstream.

In the "ibm,configure-pe" and "ibm,configure-bridge" RTAS calls, the
spec states that values of 9900-9905 can be returned, indicating that
software should delay for 10^x (where x is the last digit, i.e. 990x)
milliseconds and attempt the call again. Currently, the kernel doesn't
know about this, and respecting it fixes some PCI failures when the
hypervisor is busy.

The delay is capped at 0.2 seconds.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Russell Currey 2016-04-07 16:28:26 +10:00 • committed by Ben Hutchings

parent 18fc60a67a

commit 062e414cf4

1 changed files with 36 additions and 15 deletions

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arch/powerpc/platforms/pseries/eeh_pseries.c

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