[PATCH v3 3/3] arch_topology: Fix cache attributes detection in the CPU hotplug path

[Sudeep Holla]

init_cpu_topology() is called only once at the boot and all the cache
attributes are detected early for all the possible CPUs. However when
the CPUs are hotplugged out, the cacheinfo gets removed. While the
attributes are added back when the CPUs are hotplugged back in as part
of CPU hotplug state machine, it ends up called quite late after the
update_siblings_masks() are called in the secondary_start_kernel()
resulting in wrong llc_sibling_masks.

Move the call to detect_cache_attributes() inside update_siblings_masks()
to ensure the cacheinfo is updated before the LLC sibling masks are
updated. This will fix the incorrect LLC sibling masks generated when
the CPUs are hotplugged out and hotplugged back in again.

Reported-by: Ionela Voinescu <ionela.voinescu at arm.com>
Reviewed-by: Conor Dooley <conor.dooley at microchip.com>
Reviewed-by: Ionela Voinescu <ionela.voinescu at arm.com>
Tested-by: Geert Uytterhoeven <geert+renesas at glider.be>
Tested-by: Ionela Voinescu <ionela.voinescu at arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 441e14ac33a4..0424b59b695e 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -732,7 +732,11 @@ const struct cpumask *cpu_clustergroup_mask(int cpu)
 void update_siblings_masks(unsigned int cpuid)
 {
 	struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
-	int cpu;
+	int cpu, ret;
+
+	ret = detect_cache_attributes(cpuid);
+	if (ret)
+		pr_info("Early cacheinfo failed, ret = %d\n", ret);
 
 	/* update core and thread sibling masks */
 	for_each_online_cpu(cpu) {
@@ -821,7 +825,7 @@ __weak int __init parse_acpi_topology(void)
 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 void __init init_cpu_topology(void)
 {
-	int ret, cpu;
+	int ret;
 
 	reset_cpu_topology();
 	ret = parse_acpi_topology();
@@ -836,13 +840,5 @@ void __init init_cpu_topology(void)
 		reset_cpu_topology();
 		return;
 	}
-
-	for_each_possible_cpu(cpu) {
-		ret = detect_cache_attributes(cpu);
-		if (ret) {
-			pr_info("Early cacheinfo failed, ret = %d\n", ret);
-			break;
-		}
-	}
 }
 #endif

-- 
b4 0.10.0-dev-54fef