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}; +#ifdef CONFIG_SYSFS +static ssize_t scan_sleep_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kmmscand_scan_sleep_ms); +} + +static ssize_t scan_sleep_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int msecs; + int err; + + err = kstrtouint(buf, 10, &msecs); + if (err) + return -EINVAL; + + kmmscand_scan_sleep_ms = msecs; + kmmscand_sleep_expire = 0; + wake_up_interruptible(&kmmscand_wait); + + return count; +} +static struct kobj_attribute scan_sleep_ms_attr = + __ATTR_RW(scan_sleep_ms); + +static ssize_t mm_scan_period_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kmmscand_mm_scan_period_ms); +} + +/* If a value less than MIN or greater than MAX asked for store value is clamped */ +static ssize_t mm_scan_period_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int msecs, stored_msecs; + int err; + + err = kstrtouint(buf, 10, &msecs); + if (err) + return -EINVAL; + + stored_msecs = clamp(msecs, KMMSCAND_SCAN_PERIOD_MIN, KMMSCAND_SCAN_PERIOD_MAX); + + kmmscand_mm_scan_period_ms = stored_msecs; + kmmscand_sleep_expire = 0; + wake_up_interruptible(&kmmscand_wait); + + return count; +} + +static struct kobj_attribute mm_scan_period_ms_attr = + __ATTR_RW(mm_scan_period_ms); + +static ssize_t mms_to_scan_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%lu\n", kmmscand_mms_to_scan); +} + +static ssize_t mms_to_scan_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return -EINVAL; + + kmmscand_mms_to_scan = val; + kmmscand_sleep_expire = 0; + wake_up_interruptible(&kmmscand_wait); + + return count; +} + +static struct kobj_attribute mms_to_scan_attr = + __ATTR_RW(mms_to_scan); + +static ssize_t scan_enabled_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kmmscand_scan_enabled ? 1 : 0); +} + +static ssize_t scan_enabled_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int val; + int err; + + err = kstrtouint(buf, 10, &val); + if (err || val > 1) + return -EINVAL; + + if (val) { + kmmscand_scan_enabled = true; + need_wakeup = true; + } else + kmmscand_scan_enabled = false; + + kmmscand_sleep_expire = 0; + wake_up_interruptible(&kmmscand_wait); + + return count; +} + +static struct kobj_attribute scan_enabled_attr = + __ATTR_RW(scan_enabled); + +static ssize_t target_node_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kmmscand_target_node); +} + +static ssize_t target_node_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int err, node; + + err = kstrtoint(buf, 10, &node); + if (err) + return -EINVAL; + + kmmscand_sleep_expire = 0; + if (!node_is_toptier(node)) + return -EINVAL; + + kmmscand_target_node = node; + wake_up_interruptible(&kmmscand_wait); + + return count; +} +static struct kobj_attribute target_node_attr = + __ATTR_RW(target_node); + +static struct attribute *kmmscand_attr[] = { + &scan_sleep_ms_attr.attr, + &mm_scan_period_ms_attr.attr, + &mms_to_scan_attr.attr, + &scan_enabled_attr.attr, + &target_node_attr.attr, + NULL, +}; + +struct attribute_group kmmscand_attr_group = { + .attrs = kmmscand_attr, + .name = "kmmscand", +}; +#endif + static int kmmscand_has_work(void) { return !list_empty(&kmmscand_scan.mm_head); @@ -738,9 +903,43 @@ static int kmmscand(void *none) return 0; } +#ifdef CONFIG_SYSFS +extern struct kobject *mm_kobj; +static int __init kmmscand_init_sysfs(struct kobject **kobj) +{ + int err; + + err = sysfs_create_group(*kobj, &kmmscand_attr_group); + if (err) { + pr_err("failed to register kmmscand group\n"); + goto err_kmmscand_attr; + } + + return 0; + +err_kmmscand_attr: + sysfs_remove_group(*kobj, &kmmscand_attr_group); + return err; +} + +static void __init kmmscand_exit_sysfs(struct kobject *kobj) +{ + sysfs_remove_group(kobj, &kmmscand_attr_group); +} +#else +static inline int __init kmmscand_init_sysfs(struct kobject **kobj) +{ + return 0; +} +static inline void __init kmmscand_exit_sysfs(struct kobject *kobj) +{ +} +#endif + static inline void kmmscand_destroy(void) { kmem_cache_destroy(kmmscand_slot_cache); + kmmscand_exit_sysfs(mm_kobj); } void __kmmscand_enter(struct mm_struct *mm) @@ -857,6 +1056,11 @@ static int __init kmmscand_init(void) return -ENOMEM; } + err = kmmscand_init_sysfs(&mm_kobj); + + if (err) + goto err_init_sysfs; + err = start_kmmscand(); if (err) goto err_kmmscand; @@ -865,6 +1069,7 @@ static int __init kmmscand_init(void) err_kmmscand: stop_kmmscand(); +err_init_sysfs: kmmscand_destroy(); return err; -- 2.39.3