cpu: Make cpu_get_core_index() return the fused core number

cpu_get_core_index() currently uses pir_to_core_id() which returns
an EC number always (ie, a normal core number) even in fused core
mode. This is inconsistent with cpu_get_thread_index() which returns
a thread within a fused core (0...7) on P9.

So let's make things consistent and document it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

2 files changed, 14 insertions, 1 deletions

diff --git a/core/chip.c b/core/chip.c
index c57694a..f1269d3 100644
--- a/core/chip.c
+++ b/core/chip.c
@@ -34,6 +34,19 @@ uint32_t pir_to_core_id(uint32_t pir)
 		assert(false);
 }
 
+uint32_t pir_to_fused_core_id(uint32_t pir)
+{
+	if (proc_gen == proc_gen_p9) {
+		if (this_cpu()->is_fused_core)
+			return P9_PIR2FUSEDCOREID(pir);
+		else
+			return P9_PIR2COREID(pir);
+	} else if (proc_gen == proc_gen_p8)
+		return P8_PIR2COREID(pir);
+	else
+		assert(false);
+}
+
 uint32_t pir_to_thread_id(uint32_t pir)
 {
 	if (proc_gen == proc_gen_p9) {
diff --git a/core/cpu.c b/core/cpu.c
index 9d2cd56..ff0442a 100644
--- a/core/cpu.c
+++ b/core/cpu.c
@@ -866,7 +866,7 @@ struct cpu_thread *first_available_core_in_chip(u32 chip_id)
 
 uint32_t cpu_get_core_index(struct cpu_thread *cpu)
 {
-	return pir_to_core_id(cpu->pir);
+	return pir_to_fused_core_id(cpu->pir);
 }
 
 void cpu_remove_node(const struct cpu_thread *t)