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
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(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
min_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)34 static 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
min_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t count)43 static 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
max_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)59 static 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
max_store(struct kobject * kobj,struct kobj_attribute * attr,const char * buf,size_t count)68 static 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
damon_sysfs_ul_range_release(struct kobject * kobj)84 void damon_sysfs_ul_range_release(struct kobject *kobj)
85 {
86 kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj));
87 }
88
89 static struct kobj_attribute damon_sysfs_ul_range_min_attr =
90 __ATTR_RW_MODE(min, 0600);
91
92 static struct kobj_attribute damon_sysfs_ul_range_max_attr =
93 __ATTR_RW_MODE(max, 0600);
94
95 static 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 };
100 ATTRIBUTE_GROUPS(damon_sysfs_ul_range);
101
102 const 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