[Skiboot] [RFC/PATCH] affinity: Use fabric node ID on most systems

[Benjamin Herrenschmidt]

Except Murano where we stick to the module ID from HDAT

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 core/affinity.c | 42 ++++++++++++++++++++++--------------------
 1 file changed, 22 insertions(+), 20 deletions(-)

diff --git a/core/affinity.c b/core/affinity.c
index 9f489d3..d3df910 100644
--- a/core/affinity.c
+++ b/core/affinity.c
@@ -54,35 +54,37 @@
 
 static uint32_t get_chip_node_id(struct proc_chip *chip)
 {
-	/* If the xscom node has an ibm,ccm-node-id property, use it */
-	if (dt_has_node_property(chip->devnode, "ibm,ccm-node-id", NULL))
-		return dt_prop_get_u32(chip->devnode, "ibm,ccm-node-id");
-
 	/*
 	 * Else use the 3 top bits of the chip ID which should be
-	 * the node on both P7 and P8
+	 * the node on P7, P8 and P9
 	 */
 	return chip->id >> 3;
 }
 
 void add_associativity_ref_point(void)
 {
-	int ref2 = 0x4;
+	uint32_t ref2 = 0x1;
 
 	/*
 	 * Note about our use of reference points:
 	 *
-	 * Linux currently supports two levels of NUMA. We use the first
+	 * Linux currently supports two levels of NUMA. It uses the first
 	 * reference point for the node ID and the second reference point
-	 * for a second level of affinity. We always use the chip ID (4)
-	 * for the first reference point.
+	 * for a second level of affinity.
+	 *
+	 * We always pass the chip ID (4) for the first reference point.
+	 *
+	 * We pass the "module ID" (3) as the second point. When it doesn't
+	 * exist in the DT we inherit the chip node ID which on Venice
+	 * works fine. On FSP machine and P9, HDAT will provide it always.
 	 *
-	 * Choosing the second level of affinity is model specific
 	 * unfortunately. Current POWER8E models should use the DCM
 	 * 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.
+	 *
+	 * On P9 system we always use the PowerBus node ID
 	 */
 	if (PVR_TYPE(mfspr(SPR_PVR)) == PVR_TYPE_P8E)
 		ref2 = 0x3;
@@ -95,23 +97,23 @@ void add_chip_dev_associativity(struct dt_node *dev)
 {
 	uint32_t chip_id = dt_get_chip_id(dev);
 	struct proc_chip *chip = get_chip(chip_id);
-	uint32_t hw_cid, hw_mid;
+	uint32_t hw_cid, hw_mid, cn_id;
 
 	if (!chip)
 		return;
 
-	hw_cid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-card-id", 0);
-	hw_mid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-module-id", 0);
+	cn_id = get_chip_node_id(chip);
+	hw_cid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-card-id", cn_id);
+	hw_mid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-module-id", cn_id);
 
 	dt_add_property_cells(dev, "ibm,associativity", 4,
-			      get_chip_node_id(chip),
-			      hw_cid, hw_mid, chip_id);
+			      cn_id, hw_cid, hw_mid, chip_id);
 }
 
 void add_core_associativity(struct cpu_thread *cpu)
 {
 	struct proc_chip *chip = get_chip(cpu->chip_id);
-	uint32_t hw_cid, hw_mid, core_id;
+	uint32_t hw_cid, hw_mid, core_id, cn_id;
 
 	if (!chip)
 		return;
@@ -125,10 +127,10 @@ void add_core_associativity(struct cpu_thread *cpu)
 	else
 		return;
 
-	hw_cid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-card-id", 0);
-	hw_mid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-module-id", 0);
+	cn_id = get_chip_node_id(chip);
+	hw_cid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-card-id", cn_id);
+	hw_mid = dt_prop_get_u32_def(chip->devnode, "ibm,hw-module-id", cn_id);
 
 	dt_add_property_cells(cpu->node, "ibm,associativity", 5,
-			      get_chip_node_id(chip),
-			      hw_cid, hw_mid, chip->id, core_id);
+			      cn_id, hw_cid, hw_mid, chip->id, core_id);
 }