topology/sysfs: provide drawer id and siblings attributes
The s390 cpu topology gained another hierarchy level. The top level is
now called drawer and contains several books. A book used to be the
top level.
In order to expose the cpu topology to user space allow to create new
sysfs attributes dependent on CONFIG_SCHED_DRAWER which an
architecture may define and select.
These additional attributes will be available:
/sys/devices/system/cpu/cpuX/topology/drawer_id
/sys/devices/system/cpu/cpuX/topology/drawer_siblings
/sys/devices/system/cpu/cpuX/topology/drawer_siblings_list
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index 8b7d7f8..df3c97c 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -77,6 +77,14 @@
static DEVICE_ATTR_RO(book_siblings_list);
#endif
+#ifdef CONFIG_SCHED_DRAWER
+define_id_show_func(drawer_id);
+static DEVICE_ATTR_RO(drawer_id);
+define_siblings_show_func(drawer_siblings, drawer_cpumask);
+static DEVICE_ATTR_RO(drawer_siblings);
+static DEVICE_ATTR_RO(drawer_siblings_list);
+#endif
+
static struct attribute *default_attrs[] = {
&dev_attr_physical_package_id.attr,
&dev_attr_core_id.attr,
@@ -89,6 +97,11 @@
&dev_attr_book_siblings.attr,
&dev_attr_book_siblings_list.attr,
#endif
+#ifdef CONFIG_SCHED_DRAWER
+ &dev_attr_drawer_id.attr,
+ &dev_attr_drawer_siblings.attr,
+ &dev_attr_drawer_siblings_list.attr,
+#endif
NULL
};