powerpc/pseries: PAPR persistent memory support

This patch implements support for discovering storage class memory
devices at boot and for handling hotplug of new regions via RTAS
hotplug events.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
[mpe: Fix CONFIG_MEMORY_HOTPLUG=n build]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/pseries/pseries.h

@@ -65,11 +65,16 @@ int handle_dlpar_errorlog(struct pseries_hp_errorlog *hp_errlog);
 
 #ifdef CONFIG_MEMORY_HOTPLUG
 int dlpar_memory(struct pseries_hp_errorlog *hp_elog);
+int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog);
 #else
 static inline int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
 {
 	return -EOPNOTSUPP;
 }
+static inline int dlpar_hp_pmem(struct pseries_hp_errorlog *hp_elog)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 
 #ifdef CONFIG_HOTPLUG_CPU