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1// SPDX-License-Identifier: GPL-2.02/*3 * Common Primitives for DAMON Sysfs Interface4 *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 directory16 */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