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