Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * File attributes for Mediated devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *     Author: Neo Jia <cjia@nvidia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *             Kirti Wankhede <kwankhede@nvidia.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/uuid.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "mdev_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) /* Static functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static ssize_t mdev_type_attr_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 				     struct attribute *__attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct mdev_type *type = to_mdev_type(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	ssize_t ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	if (attr->show)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 		ret = attr->show(kobj, type->parent->dev, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static ssize_t mdev_type_attr_store(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 				      struct attribute *__attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 				      const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct mdev_type *type = to_mdev_type(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	ssize_t ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (attr->store)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		ret = attr->store(&type->kobj, type->parent->dev, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static const struct sysfs_ops mdev_type_sysfs_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	.show = mdev_type_attr_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	.store = mdev_type_attr_store,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static ssize_t create_store(struct kobject *kobj, struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			    const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	char *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	guid_t uuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	str = kstrndup(buf, count, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (!str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	ret = guid_parse(str, &uuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	kfree(str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	ret = mdev_device_create(kobj, dev, &uuid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static MDEV_TYPE_ATTR_WO(create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static void mdev_type_release(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	struct mdev_type *type = to_mdev_type(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	pr_debug("Releasing group %s\n", kobj->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	kfree(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) static struct kobj_type mdev_type_ktype = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	.sysfs_ops = &mdev_type_sysfs_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	.release = mdev_type_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 						 struct attribute_group *group)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct mdev_type *type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (!group->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		pr_err("%s: Type name empty!\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	type = kzalloc(sizeof(*type), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (!type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	type->kobj.kset = parent->mdev_types_kset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	type->parent = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 				   "%s-%s", dev_driver_string(parent->dev),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				   group->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		kobject_put(&type->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		goto attr_create_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (!type->devices_kobj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		goto attr_devices_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	ret = sysfs_create_files(&type->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 				 (const struct attribute **)group->attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		goto attrs_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	type->group = group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) attrs_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	kobject_put(type->devices_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) attr_devices_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) attr_create_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	kobject_del(&type->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	kobject_put(&type->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static void remove_mdev_supported_type(struct mdev_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	sysfs_remove_files(&type->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			   (const struct attribute **)type->group->attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	kobject_put(type->devices_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	kobject_del(&type->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	kobject_put(&type->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static int add_mdev_supported_type_groups(struct mdev_parent *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	for (i = 0; parent->ops->supported_type_groups[i]; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		struct mdev_type *type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		type = add_mdev_supported_type(parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 					parent->ops->supported_type_groups[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		if (IS_ERR(type)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 			struct mdev_type *ltype, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 			list_for_each_entry_safe(ltype, tmp, &parent->type_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 						  next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 				list_del(&ltype->next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 				remove_mdev_supported_type(ltype);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			return PTR_ERR(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		list_add(&type->next, &parent->type_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) /* mdev sysfs functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) void parent_remove_sysfs_files(struct mdev_parent *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	struct mdev_type *type, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	list_for_each_entry_safe(type, tmp, &parent->type_list, next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		list_del(&type->next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		remove_mdev_supported_type(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	kset_unregister(parent->mdev_types_kset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int parent_create_sysfs_files(struct mdev_parent *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 					       NULL, &parent->dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	if (!parent->mdev_types_kset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	INIT_LIST_HEAD(&parent->type_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	ret = sysfs_create_groups(&parent->dev->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 				  parent->ops->dev_attr_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		goto create_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	ret = add_mdev_supported_type_groups(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		sysfs_remove_groups(&parent->dev->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 				    parent->ops->dev_attr_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) create_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	kset_unregister(parent->mdev_types_kset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 			    const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	unsigned long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (kstrtoul(buf, 0, &val) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (val && device_remove_file_self(dev, attr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		ret = mdev_device_remove(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static DEVICE_ATTR_WO(remove);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static const struct attribute *mdev_device_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	&dev_attr_remove.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) int  mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		goto type_link_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		goto create_files_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) create_files_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	sysfs_remove_link(&dev->kobj, "mdev_type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) type_link_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	sysfs_remove_link(type->devices_kobj, dev_name(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	sysfs_remove_link(&dev->kobj, "mdev_type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	sysfs_remove_link(type->devices_kobj, dev_name(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }