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 | |
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(size: 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 | |
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, fmt: "%lu\n" , range->min); |
41 | } |
42 | |
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(s: buf, base: 0, res: &min); |
52 | if (err) |
53 | return err; |
54 | |
55 | range->min = min; |
56 | return count; |
57 | } |
58 | |
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, fmt: "%lu\n" , range->max); |
66 | } |
67 | |
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(s: buf, base: 0, res: &max); |
77 | if (err) |
78 | return err; |
79 | |
80 | range->max = max; |
81 | return count; |
82 | } |
83 | |
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 | |