[PATCH v10 07/30] x86/resctrl: Check all domains are offline in resctrl_exit()

[James Morse <james.morse@arm.com>]

resctrl_exit() removes things like the resctrl mount point directory
and unregisters the filesystem prior to freeing data structures that
were allocated during resctrl_init().

This assumes that there are no online domains when resctrl_exit() is
called. If any domain were online, the limbo or overflow handler could
be scheduled to run.

Add a check for any online control or monitor domains, and document that
the architecture code is required to offline all monitor and control
domains before calling resctrl_exit().

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
---
Changes since v9:
 * Clarified commit message.

Changes since v8:
 * This patch is new.
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 88197afbbb8a..f617ac97758b 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -4420,8 +4420,32 @@ int __init resctrl_init(void)
 	return ret;
 }
 
+static bool __exit resctrl_online_domains_exist(void)
+{
+	struct rdt_resource *r;
+
+	for_each_rdt_resource(r) {
+		if (!list_empty(&r->ctrl_domains) || !list_empty(&r->mon_domains))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * resctrl_exit() - Remove the resctrl filesystem and free resources.
+ *
+ * When called by the architecture code, all CPUs and resctrl domains must be
+ * offline. This ensures the limbo and overflow handlers are not scheduled to
+ * run, meaning the data structures they access can be freed by
+ * resctrl_mon_resource_exit().
+ */
 void __exit resctrl_exit(void)
 {
+	cpus_read_lock();
+	WARN_ON_ONCE(resctrl_online_domains_exist());
+	cpus_read_unlock();
+
 	debugfs_remove_recursive(debugfs_resctrl);
 	unregister_filesystem(&rdt_fs_type);
 	sysfs_remove_mount_point(fs_kobj, "resctrl");
-- 
2.39.5