powerpc/pseries: Introduce memory hotplug READD operation

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Currently, memory must be hot removed and subsequently re-added in order
to dynamically update the affinity of LMBs specified by a PRRN event.
Earlier implementations of the PRRN event handler ran into issues in which
the hot remove would occur successfully, but a hotplug event would be
initiated from another source and grab the hotplug lock preventing the hot
add from occurring. To prevent this situation, this patch introduces the
notion of a hot "readd" action for memory which atomizes a hot remove and
a hot add into a single, serialized operation on the hotplug queue.

Signed-off-by: John Allen <jallen@linux.vnet.ibm.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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John Allen 2017-01-06 13:27:26 -06:00 • committed by Michael Ellerman

parent c21f515c74

commit e70d59700f

2 changed files with 42 additions and 0 deletions

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1

arch/powerpc/include/asm/rtas.h

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41

arch/powerpc/platforms/pseries/hotplug-memory.c

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