[Skiboot] [PATCH RFC] core/affinity: Fix NUMA node associativity on P8 and P8NVL

[Gavin Shan]

We have variable distances from Node-A to Node-B on different machines
as below:

   Machine    CPU        A <-> A     A <-> B
   ------------------------------------------
   Tuleta     POWER8E    10          20
   Firestone  POWER8     10          40
   Garrison   POWER8NVL  10          40

This fixes the distance between Node-A and Node-B to 20 for all POWER8
platforms, which is the value defined by Linux kernel. After the patch
is applied, we have:

   Machine    CPU        A <-> A     A <-> B
   ------------------------------------------
   Tuleta     POWER8E    10          20
   Firestone  POWER8     10          40
   Garrison   POWER8NVL  10          40

Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
---
 core/affinity.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/core/affinity.c b/core/affinity.c
index 9f489d3..64c1fda 100644
--- a/core/affinity.c
+++ b/core/affinity.c
@@ -67,6 +67,7 @@ static uint32_t get_chip_node_id(struct proc_chip *chip)
 
 void add_associativity_ref_point(void)
 {
+	unsigned long pvr = mfspr(SPR_PVR);
 	int ref2 = 0x4;
 
 	/*
@@ -82,9 +83,12 @@ void add_associativity_ref_point(void)
 	 * as a second level of NUMA.
 	 *
 	 * If there is a way to obtain this information from the FSP
-	 * that would be ideal, but for now hardwire our POWER8E setting.
+	 * that would be ideal, but for now hardwire our POWER8E, POWER8
+	 * and POWER8NVL setting.
 	 */
-	if (PVR_TYPE(mfspr(SPR_PVR)) == PVR_TYPE_P8E)
+	if (PVR_TYPE(pvr) == PVR_TYPE_P8E ||
+	    PVR_TYPE(pvr) == PVR_TYPE_P8  ||
+	    PVR_TYPE(pvr) == PVR_TYPE_P8NVL)
 		ref2 = 0x3;
 
 	dt_add_property_cells(opal_node, "ibm,associativity-reference-points",
-- 
2.7.4