282 lines
6.2 KiB
C
282 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* File attributes for Mediated devices
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*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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* Author: Neo Jia <cjia@nvidia.com>
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* Kirti Wankhede <kwankhede@nvidia.com>
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*/
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#include <linux/sysfs.h>
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#include <linux/ctype.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/uuid.h>
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#include <linux/mdev.h>
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#include "mdev_private.h"
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/* Static functions */
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static ssize_t mdev_type_attr_show(struct kobject *kobj,
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struct attribute *__attr, char *buf)
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{
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struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
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struct mdev_type *type = to_mdev_type(kobj);
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ssize_t ret = -EIO;
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if (attr->show)
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ret = attr->show(kobj, type->parent->dev, buf);
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return ret;
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}
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static ssize_t mdev_type_attr_store(struct kobject *kobj,
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struct attribute *__attr,
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const char *buf, size_t count)
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{
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struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
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struct mdev_type *type = to_mdev_type(kobj);
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ssize_t ret = -EIO;
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if (attr->store)
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ret = attr->store(&type->kobj, type->parent->dev, buf, count);
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return ret;
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}
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static const struct sysfs_ops mdev_type_sysfs_ops = {
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.show = mdev_type_attr_show,
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.store = mdev_type_attr_store,
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};
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static ssize_t create_store(struct kobject *kobj, struct device *dev,
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const char *buf, size_t count)
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{
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char *str;
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guid_t uuid;
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int ret;
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if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
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return -EINVAL;
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str = kstrndup(buf, count, GFP_KERNEL);
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if (!str)
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return -ENOMEM;
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ret = guid_parse(str, &uuid);
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kfree(str);
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if (ret)
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return ret;
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ret = mdev_device_create(kobj, dev, &uuid);
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if (ret)
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return ret;
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return count;
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}
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static MDEV_TYPE_ATTR_WO(create);
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static void mdev_type_release(struct kobject *kobj)
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{
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struct mdev_type *type = to_mdev_type(kobj);
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pr_debug("Releasing group %s\n", kobj->name);
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kfree(type);
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}
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static struct kobj_type mdev_type_ktype = {
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.sysfs_ops = &mdev_type_sysfs_ops,
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.release = mdev_type_release,
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};
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static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
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struct attribute_group *group)
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{
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struct mdev_type *type;
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int ret;
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if (!group->name) {
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pr_err("%s: Type name empty!\n", __func__);
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return ERR_PTR(-EINVAL);
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}
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type = kzalloc(sizeof(*type), GFP_KERNEL);
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if (!type)
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return ERR_PTR(-ENOMEM);
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type->kobj.kset = parent->mdev_types_kset;
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ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
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"%s-%s", dev_driver_string(parent->dev),
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group->name);
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if (ret) {
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kobject_put(&type->kobj);
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return ERR_PTR(ret);
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}
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ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr);
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if (ret)
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goto attr_create_failed;
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type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
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if (!type->devices_kobj) {
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ret = -ENOMEM;
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goto attr_devices_failed;
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}
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ret = sysfs_create_files(&type->kobj,
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(const struct attribute **)group->attrs);
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if (ret) {
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ret = -ENOMEM;
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goto attrs_failed;
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}
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type->group = group;
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type->parent = parent;
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return type;
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attrs_failed:
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kobject_put(type->devices_kobj);
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attr_devices_failed:
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sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
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attr_create_failed:
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kobject_del(&type->kobj);
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kobject_put(&type->kobj);
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return ERR_PTR(ret);
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}
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static void remove_mdev_supported_type(struct mdev_type *type)
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{
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sysfs_remove_files(&type->kobj,
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(const struct attribute **)type->group->attrs);
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kobject_put(type->devices_kobj);
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sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
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kobject_del(&type->kobj);
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kobject_put(&type->kobj);
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}
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static int add_mdev_supported_type_groups(struct mdev_parent *parent)
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{
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int i;
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for (i = 0; parent->ops->supported_type_groups[i]; i++) {
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struct mdev_type *type;
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type = add_mdev_supported_type(parent,
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parent->ops->supported_type_groups[i]);
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if (IS_ERR(type)) {
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struct mdev_type *ltype, *tmp;
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list_for_each_entry_safe(ltype, tmp, &parent->type_list,
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next) {
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list_del(<ype->next);
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remove_mdev_supported_type(ltype);
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}
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return PTR_ERR(type);
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}
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list_add(&type->next, &parent->type_list);
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}
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return 0;
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}
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/* mdev sysfs functions */
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void parent_remove_sysfs_files(struct mdev_parent *parent)
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{
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struct mdev_type *type, *tmp;
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list_for_each_entry_safe(type, tmp, &parent->type_list, next) {
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list_del(&type->next);
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remove_mdev_supported_type(type);
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}
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sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups);
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kset_unregister(parent->mdev_types_kset);
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}
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int parent_create_sysfs_files(struct mdev_parent *parent)
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{
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int ret;
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parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
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NULL, &parent->dev->kobj);
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if (!parent->mdev_types_kset)
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return -ENOMEM;
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INIT_LIST_HEAD(&parent->type_list);
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ret = sysfs_create_groups(&parent->dev->kobj,
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parent->ops->dev_attr_groups);
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if (ret)
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goto create_err;
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ret = add_mdev_supported_type_groups(parent);
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if (ret)
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sysfs_remove_groups(&parent->dev->kobj,
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parent->ops->dev_attr_groups);
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else
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return ret;
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create_err:
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kset_unregister(parent->mdev_types_kset);
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return ret;
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}
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static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned long val;
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if (kstrtoul(buf, 0, &val) < 0)
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return -EINVAL;
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if (val && device_remove_file_self(dev, attr)) {
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int ret;
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ret = mdev_device_remove(dev);
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if (ret)
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return ret;
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}
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return count;
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}
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static DEVICE_ATTR_WO(remove);
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static const struct attribute *mdev_device_attrs[] = {
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&dev_attr_remove.attr,
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NULL,
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};
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int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
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{
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int ret;
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ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
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if (ret)
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return ret;
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ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
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if (ret)
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goto type_link_failed;
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ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
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if (ret)
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goto create_files_failed;
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return ret;
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create_files_failed:
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sysfs_remove_link(&dev->kobj, "mdev_type");
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type_link_failed:
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sysfs_remove_link(type->devices_kobj, dev_name(dev));
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return ret;
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}
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void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
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{
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sysfs_remove_files(&dev->kobj, mdev_device_attrs);
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sysfs_remove_link(&dev->kobj, "mdev_type");
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sysfs_remove_link(type->devices_kobj, dev_name(dev));
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}
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