[PATCH v2 3/8] arch_topology: Set cluster identifier in each core/thread from /cpu-map

Sudeep Holla
2022-05-18T09:35:47Z

Let us set the cluster identifier as parsed from the device tree
cluster nodes within /cpu-map.

We don't support nesting of clusters yet as there are no real hardware
to support clusters of clusters.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/base/arch_topology.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 7f5aa655c1f4..bdb6f2a17df0 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -491,7 +491,7 @@ static int __init get_cpu_for_node(struct device_node *node)
}

static int __init parse_core(struct device_node *core, int package_id,
- int core_id)
+ int cluster_id, int core_id)
{
char name[20];
bool leaf = true;
@@ -507,6 +507,7 @@ static int __init parse_core(struct device_node *core, int package_id,
cpu = get_cpu_for_node(t);
if (cpu >= 0) {
cpu_topology[cpu].package_id = package_id;
+ cpu_topology[cpu].cluster_id = cluster_id;
cpu_topology[cpu].core_id = core_id;
cpu_topology[cpu].thread_id = i;
} else if (cpu != -ENODEV) {
@@ -528,6 +529,7 @@ static int __init parse_core(struct device_node *core, int package_id,
}

cpu_topology[cpu].package_id = package_id;
+ cpu_topology[cpu].cluster_id = cluster_id;
cpu_topology[cpu].core_id = core_id;
} else if (leaf && cpu != -ENODEV) {
pr_err("%pOF: Can't get CPU for leaf core\n", core);
@@ -537,7 +539,8 @@ static int __init parse_core(struct device_node *core, int package_id,
return 0;
}

-static int __init parse_cluster(struct device_node *cluster, int depth)
+static int __init
+parse_cluster(struct device_node *cluster, int cluster_id, int depth)
{
char name[20];
bool leaf = true;
@@ -557,7 +560,7 @@ static int __init parse_cluster(struct device_node *cluster, int depth)
c = of_get_child_by_name(cluster, name);
if (c) {
leaf = false;
- ret = parse_cluster(c, depth + 1);
+ ret = parse_cluster(c, i, depth + 1);
of_node_put(c);
if (ret != 0)
return ret;
@@ -581,7 +584,7 @@ static int __init parse_cluster(struct device_node *cluster, int depth)
}

if (leaf) {
- ret = parse_core(c, 0, core_id++);
+ ret = parse_core(c, 0, cluster_id, core_id++);
} else {
pr_err("%pOF: Non-leaf cluster with core %s\n",
cluster, name);
@@ -621,7 +624,7 @@ static int __init parse_dt_topology(void)
if (!map)
goto out;

- ret = parse_cluster(map, 0);
+ ret = parse_cluster(map, -1, 0);
if (ret != 0)
goto out_map;

--
2.36.1