path: root/mm/damon/sysfs-schemes.c

// SPDX-License-Identifier: GPL-2.0
/*
 * DAMON sysfs Interface
 *
 * Copyright (c) 2022 SeongJae Park <sj@kernel.org>
 */

#include <linux/slab.h>

#include "sysfs-common.h"

/*
 * scheme region directory
 */

struct damon_sysfs_scheme_region {
	struct kobject kobj;
	struct damon_addr_range ar;
	unsigned int nr_accesses;
	unsigned int age;
	struct list_head list;
};

static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc(
		struct damon_region *region)
{
	struct damon_sysfs_scheme_region *sysfs_region = kmalloc(
			sizeof(*sysfs_region), GFP_KERNEL);

	if (!sysfs_region)
		return NULL;
	sysfs_region->kobj = (struct kobject){};
	sysfs_region->ar = region->ar;
	sysfs_region->nr_accesses = region->nr_accesses;
	sysfs_region->age = region->age;
	INIT_LIST_HEAD(&sysfs_region->list);
	return sysfs_region;
}

static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr,
		char *buf)
{
	struct damon_sysfs_scheme_region *region = container_of(kobj,
			struct damon_sysfs_scheme_region, kobj);

	return sysfs_emit(buf, "%lu\n", region->ar.start);
}

static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr,
		char *buf)
{
	struct damon_sysfs_scheme_region *region = container_of(kobj,
			struct damon_sysfs_scheme_region, kobj);

	return sysfs_emit(buf, "%lu\n", region->ar.end);
}

static ssize_t nr_accesses_show(struct kobject *kobj,
		struct kobj_attribute *attr, char *buf)
{
	struct damon_sysfs_scheme_region *region = container_of(kobj,
			struct damon_sysfs_scheme_region, kobj);

	return sysfs_emit(buf, "%u\n", region->nr_accesses);
}

static ssize_t age_show(struct kobject *kobj, struct kobj_attribute *attr,
		char *buf)
{
	struct damon_sysfs_scheme_region *region = container_of(kobj,
			struct damon_sysfs_scheme_region, kobj);

	return sysfs_emit(buf, "%u\n", region->age);
}

static void damon_sysfs_scheme_region_release(struct kobject *kobj)
{
	struct damon_sysfs_scheme_region *region = container_of(kobj,
			struct damon_sysfs_scheme_region, kobj);

	list_del(&region->list);
	kfree(region);
}

static struct kobj_attribute damon_sysfs_scheme_region_start_attr =