[RFC PATCH 22/27] mm/damon/sysfs: implement report producer addr_{start,end} files

[SJ Park <sj@kernel.org>]

Implement addr_start and addr_end sysfs files under report producer
directory.  Those set and get the address range of the user_report type
data attribute reports.

Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/sysfs.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index b4d898ec0c9f7..5f9bb1955dfd5 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -3047,6 +3047,7 @@ struct damon_sysfs_producer {
 	struct kobject kobj;
 	enum damon_report_type report_type;
 	bool enabled;
+	struct damon_addr_range addr_range;
 };
 
 static struct damon_sysfs_producer *damon_sysfs_producer_alloc(void)
@@ -3116,6 +3117,44 @@ static ssize_t producer_state_store(struct kobject *kobj,
 	return count;
 }
 
+static ssize_t addr_start_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_producer *producer = container_of(kobj,
+			struct damon_sysfs_producer, kobj);
+
+	return sysfs_emit(buf, "%lu\n", producer->addr_range.start);
+}
+
+static ssize_t addr_start_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_producer *producer = container_of(kobj,
+			struct damon_sysfs_producer, kobj);
+	int err = kstrtoul(buf, 0, &producer->addr_range.start);
+
+	return err ? err : count;
+}
+
+static ssize_t addr_end_show(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+	struct damon_sysfs_producer *producer = container_of(kobj,
+			struct damon_sysfs_producer, kobj);
+
+	return sysfs_emit(buf, "%lu\n", producer->addr_range.end);
+}
+
+static ssize_t addr_end_store(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count)
+{
+	struct damon_sysfs_producer *producer = container_of(kobj,
+			struct damon_sysfs_producer, kobj);
+	int err = kstrtoul(buf, 0, &producer->addr_range.end);
+
+	return err ? err : count;
+}
+
 static void damon_sysfs_producer_release(struct kobject *kobj)
 {
 	struct damon_sysfs_producer *producer = container_of(kobj,
@@ -3127,10 +3166,16 @@ static struct kobj_attribute damon_sysfs_producer_report_type_attr =
 		__ATTR_RW_MODE(report_type, 0600);
 static struct kobj_attribute damon_sysfs_producer_producer_state_type_attr =
 		__ATTR_RW_MODE(producer_state, 0600);
+static struct kobj_attribute damon_sysfs_producer_addr_start_type_attr =
+		__ATTR_RW_MODE(addr_start, 0600);
+static struct kobj_attribute damon_sysfs_producer_addr_end_type_attr =
+		__ATTR_RW_MODE(addr_end, 0600);
 
 static struct attribute *damon_sysfs_producer_attrs[] = {
 	&damon_sysfs_producer_report_type_attr.attr,
 	&damon_sysfs_producer_producer_state_type_attr.attr,
+	&damon_sysfs_producer_addr_start_type_attr.attr,
+	&damon_sysfs_producer_addr_end_type_attr.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(damon_sysfs_producer);
-- 
2.47.3