[07/12] mm/damon/sysfs: Support DAMOS quotas

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 2350a637e662..a14caeb5b6a1 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -115,6 +115,115 @@  static struct kobj_type damon_sysfs_ul_range_ktype = {
 	.default_groups = damon_sysfs_ul_range_groups,
 };
 
+/*
+ * quotas directory
+ */
+
+struct damon_sysfs_quotas {
+	struct kobject kobj;
+	unsigned long ms;
+	unsigned long sz;
+	unsigned long reset_interval_ms;
+};
+
+static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void)
+{
+	return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL);
+}
+
+static ssize_t damon_sysfs_quotas_ms_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+
+	return sysfs_emit(buf, "%lu\n", quotas->ms);
+}
+
+static ssize_t damon_sysfs_quotas_ms_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int err = kstrtoul(buf, 0, &quotas->ms);
+
+	if (err)
+		return -EINVAL;
+	return count;
+}
+
+static ssize_t damon_sysfs_quotas_sz_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+
+	return sysfs_emit(buf, "%lu\n", quotas->sz);
+}
+
+static ssize_t damon_sysfs_quotas_sz_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int err = kstrtoul(buf, 0, &quotas->sz);
+
+	if (err)
+		return -EINVAL;
+	return count;
+}
+
+static ssize_t damon_sysfs_quotas_reset_interval_ms_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+
+	return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms);
+}
+
+static ssize_t damon_sysfs_quotas_reset_interval_ms_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_quotas *quotas = container_of(kobj,
+			struct damon_sysfs_quotas, kobj);
+	int err = kstrtoul(buf, 0, &quotas->reset_interval_ms);
+
+	if (err)
+		return -EINVAL;
+	return count;
+}
+
+static void damon_sysfs_quotas_release(struct kobject *kobj)
+{
+	kfree(container_of(kobj, struct damon_sysfs_quotas, kobj));
+}
+
+static struct kobj_attribute damon_sysfs_quotas_ms_attr = __ATTR(ms, 0600,
+		damon_sysfs_quotas_ms_show, damon_sysfs_quotas_ms_store);
+
+static struct kobj_attribute damon_sysfs_quotas_sz_attr = __ATTR(sz, 0600,
+		damon_sysfs_quotas_sz_show, damon_sysfs_quotas_sz_store);
+
+static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr =
+		__ATTR(reset_interval_ms, 0600,
+			damon_sysfs_quotas_reset_interval_ms_show,
+			damon_sysfs_quotas_reset_interval_ms_store);
+
+static struct attribute *damon_sysfs_quotas_attrs[] = {
+	&damon_sysfs_quotas_ms_attr.attr,
+	&damon_sysfs_quotas_sz_attr.attr,
+	&damon_sysfs_quotas_reset_interval_ms_attr.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(damon_sysfs_quotas);
+
+static struct kobj_type damon_sysfs_quotas_ktype = {
+	.release = damon_sysfs_quotas_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+	.default_groups = damon_sysfs_quotas_groups,
+};
+
 /*
  * access_pattern directory
  */
@@ -222,6 +331,7 @@  struct damon_sysfs_scheme {
 	struct kobject kobj;
 	enum damos_action action;
 	struct damon_sysfs_access_pattern *access_pattern;
+	struct damon_sysfs_quotas *quotas;
 };
 
 /* This should match with enum damos_action */
@@ -272,6 +382,24 @@  static int damon_sysfs_scheme_set_access_pattern(
 	return err;
 }
 
+static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme)
+{
+	struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc();
+	int err;
+
+	if (!quotas)
+		return -ENOMEM;
+	err = kobject_init_and_add(&quotas->kobj, &damon_sysfs_quotas_ktype,
+			&scheme->kobj, "quotas");
+	if (err)
+		goto out;
+	return 0;
+
+out:
+	kobject_put(&quotas->kobj);
+	return err;
+}
+
 static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 {
 	int err;
@@ -279,13 +407,22 @@  static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 	err = damon_sysfs_scheme_set_access_pattern(scheme);
 	if (err)
 		return err;
+	err = damon_sysfs_scheme_set_quotas(scheme);
+	if (err)
+		goto put_access_pattern_out;
 	return 0;
+
+put_access_pattern_out:
+	kobject_put(&scheme->access_pattern->kobj);
+	scheme->access_pattern = NULL;
+	return err;
 }
 
 static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme)
 {
 	damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern);
 	kobject_put(&scheme->access_pattern->kobj);
+	kobject_put(&scheme->quotas->kobj);
 }
 
 static ssize_t damon_sysfs_scheme_action_show(struct kobject *kobj,
@@ -1533,10 +1670,10 @@  static struct damos *damon_sysfs_mk_scheme(
 {
 	struct damon_sysfs_access_pattern *pattern =
 		sysfs_scheme->access_pattern;
+	struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas;
 	struct damos_quota quota = {
-		.ms = 0,
-		.sz = 0,
-		.reset_interval = 0,
+		.ms = sysfs_quotas->ms,
+		.sz = sysfs_quotas->sz,
 		.weight_sz = 1000,
 		.weight_nr_accesses = 1000,
 		.weight_age = 1000,