1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Common Primitives for DAMON Sysfs Interface
4 *
5 * Author: SeongJae Park <sj@kernel.org>
6 */
7
8#include <linux/slab.h>
9
10#include "sysfs-common.h"
11
12DEFINE_MUTEX(damon_sysfs_lock);
13
14/*
15 * unsigned long range directory
16 */
17
18struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc(
19		unsigned long min,
20		unsigned long max)
21{
22	struct damon_sysfs_ul_range *range = kmalloc(sizeof(*range),
23			GFP_KERNEL);
24
25	if (!range)
26		return NULL;
27	range->kobj = (struct kobject){};
28	range->min = min;
29	range->max = max;
30
31	return range;
32}
33
34static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr,
35		char *buf)
36{
37	struct damon_sysfs_ul_range *range = container_of(kobj,
38			struct damon_sysfs_ul_range, kobj);
39
40	return sysfs_emit(buf, "%lu\n", range->min);
41}
42
43static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr,
44		const char *buf, size_t count)
45{
46	struct damon_sysfs_ul_range *range = container_of(kobj,
47			struct damon_sysfs_ul_range, kobj);
48	unsigned long min;
49	int err;
50
51	err = kstrtoul(buf, 0, &min);
52	if (err)
53		return err;
54
55	range->min = min;
56	return count;
57}
58
59static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr,
60		char *buf)
61{
62	struct damon_sysfs_ul_range *range = container_of(kobj,
63			struct damon_sysfs_ul_range, kobj);
64
65	return sysfs_emit(buf, "%lu\n", range->max);
66}
67
68static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr,
69		const char *buf, size_t count)
70{
71	struct damon_sysfs_ul_range *range = container_of(kobj,
72			struct damon_sysfs_ul_range, kobj);
73	unsigned long max;
74	int err;
75
76	err = kstrtoul(buf, 0, &max);
77	if (err)
78		return err;
79
80	range->max = max;
81	return count;
82}
83
84void damon_sysfs_ul_range_release(struct kobject *kobj)
85{
86	kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj));
87}
88
89static struct kobj_attribute damon_sysfs_ul_range_min_attr =
90		__ATTR_RW_MODE(min, 0600);
91
92static struct kobj_attribute damon_sysfs_ul_range_max_attr =
93		__ATTR_RW_MODE(max, 0600);
94
95static struct attribute *damon_sysfs_ul_range_attrs[] = {
96	&damon_sysfs_ul_range_min_attr.attr,
97	&damon_sysfs_ul_range_max_attr.attr,
98	NULL,
99};
100ATTRIBUTE_GROUPS(damon_sysfs_ul_range);
101
102const struct kobj_type damon_sysfs_ul_range_ktype = {
103	.release = damon_sysfs_ul_range_release,
104	.sysfs_ops = &kobj_sysfs_ops,
105	.default_groups = damon_sysfs_ul_range_groups,
106};
107
108