From 4ef82c268383decb9bae34235bb3c21d07966932 Mon Sep 17 00:00:00 2001
From: Balazs Gerofi <bgerofi@riken.jp>
Date: Thu, 12 Jan 2017 16:20:59 +0900
Subject: [PATCH] OFP-SNC-4: offline/online MCDRAM before memory reservation

---
 arch/x86/tools/mcreboot-smp-x86.sh.in | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/x86/tools/mcreboot-smp-x86.sh.in b/arch/x86/tools/mcreboot-smp-x86.sh.in
index 51c12102..13ed14f8 100644
--- a/arch/x86/tools/mcreboot-smp-x86.sh.in
+++ b/arch/x86/tools/mcreboot-smp-x86.sh.in
@@ -306,6 +306,19 @@ if ! grep ihk_smp_x86 /proc/modules &>/dev/null; then
 		echo "error: loading ihk-smp-x86" >&2
 		error_exit "ihk_loaded"
 	fi
+
+	# Free MCDRAM (special case for OFP SNC-4 mode)
+	if [ "`hostname | grep "c[0-9][0-9][0-9][0-9].ofp"`" != "" ] && [ "`cat /sys/devices/system/node/online`" == "0-7" ]; then
+		for i in 4 5 6 7; do
+			find /sys/devices/system/node/node$i/memory*/ -name "online" | while read f; do
+				echo 0 > $f 2>&1 > /dev/null;
+			done
+			find /sys/devices/system/node/node$i/memory*/ -name "online" | while read f; do
+				echo 1 > $f 2>&1 > /dev/null;
+			done
+		done
+	fi
+
 	if ! ${SBINDIR}/ihkconfig 0 reserve mem ${mem}; then
 		echo "error: reserving memory" >&2
 		error_exit "ihk_smp_loaded"