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v4.17
 
  1/*
  2 * File attributes for Mediated devices
  3 *
  4 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
  5 *     Author: Neo Jia <cjia@nvidia.com>
  6 *             Kirti Wankhede <kwankhede@nvidia.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License version 2 as
 10 * published by the Free Software Foundation.
 11 */
 12
 13#include <linux/sysfs.h>
 14#include <linux/ctype.h>
 15#include <linux/device.h>
 16#include <linux/slab.h>
 17#include <linux/uuid.h>
 18#include <linux/mdev.h>
 19
 20#include "mdev_private.h"
 21
 22/* Static functions */
 
 
 
 
 
 
 
 
 
 
 
 
 23
 24static ssize_t mdev_type_attr_show(struct kobject *kobj,
 25				     struct attribute *__attr, char *buf)
 26{
 27	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
 28	struct mdev_type *type = to_mdev_type(kobj);
 29	ssize_t ret = -EIO;
 30
 31	if (attr->show)
 32		ret = attr->show(kobj, type->parent->dev, buf);
 33	return ret;
 34}
 35
 36static ssize_t mdev_type_attr_store(struct kobject *kobj,
 37				      struct attribute *__attr,
 38				      const char *buf, size_t count)
 39{
 40	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
 41	struct mdev_type *type = to_mdev_type(kobj);
 42	ssize_t ret = -EIO;
 43
 44	if (attr->store)
 45		ret = attr->store(&type->kobj, type->parent->dev, buf, count);
 46	return ret;
 47}
 48
 49static const struct sysfs_ops mdev_type_sysfs_ops = {
 50	.show = mdev_type_attr_show,
 51	.store = mdev_type_attr_store,
 52};
 53
 54static ssize_t create_store(struct kobject *kobj, struct device *dev,
 55			    const char *buf, size_t count)
 
 56{
 57	char *str;
 58	uuid_le uuid;
 59	int ret;
 60
 61	if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
 62		return -EINVAL;
 63
 64	str = kstrndup(buf, count, GFP_KERNEL);
 65	if (!str)
 66		return -ENOMEM;
 67
 68	ret = uuid_le_to_bin(str, &uuid);
 69	kfree(str);
 70	if (ret)
 71		return ret;
 72
 73	ret = mdev_device_create(kobj, dev, uuid);
 74	if (ret)
 75		return ret;
 76
 77	return count;
 78}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 79
 80MDEV_TYPE_ATTR_WO(create);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 81
 82static void mdev_type_release(struct kobject *kobj)
 83{
 84	struct mdev_type *type = to_mdev_type(kobj);
 85
 86	pr_debug("Releasing group %s\n", kobj->name);
 87	kfree(type);
 
 88}
 89
 90static struct kobj_type mdev_type_ktype = {
 91	.sysfs_ops = &mdev_type_sysfs_ops,
 92	.release = mdev_type_release,
 
 93};
 94
 95struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
 96					  struct attribute_group *group)
 97{
 98	struct mdev_type *type;
 99	int ret;
100
101	if (!group->name) {
102		pr_err("%s: Type name empty!\n", __func__);
103		return ERR_PTR(-EINVAL);
104	}
105
106	type = kzalloc(sizeof(*type), GFP_KERNEL);
107	if (!type)
108		return ERR_PTR(-ENOMEM);
109
110	type->kobj.kset = parent->mdev_types_kset;
 
 
 
111
112	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
113				   "%s-%s", dev_driver_string(parent->dev),
114				   group->name);
115	if (ret) {
116		kfree(type);
117		return ERR_PTR(ret);
118	}
119
120	ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr);
121	if (ret)
122		goto attr_create_failed;
123
124	type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
125	if (!type->devices_kobj) {
126		ret = -ENOMEM;
127		goto attr_devices_failed;
128	}
129
130	ret = sysfs_create_files(&type->kobj,
131				 (const struct attribute **)group->attrs);
132	if (ret) {
133		ret = -ENOMEM;
134		goto attrs_failed;
135	}
136
137	type->group = group;
138	type->parent = parent;
139	return type;
140
141attrs_failed:
142	kobject_put(type->devices_kobj);
143attr_devices_failed:
144	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
145attr_create_failed:
146	kobject_del(&type->kobj);
147	kobject_put(&type->kobj);
148	return ERR_PTR(ret);
149}
150
151static void remove_mdev_supported_type(struct mdev_type *type)
152{
153	sysfs_remove_files(&type->kobj,
154			   (const struct attribute **)type->group->attrs);
155	kobject_put(type->devices_kobj);
156	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
157	kobject_del(&type->kobj);
158	kobject_put(&type->kobj);
159}
160
161static int add_mdev_supported_type_groups(struct mdev_parent *parent)
162{
163	int i;
164
165	for (i = 0; parent->ops->supported_type_groups[i]; i++) {
166		struct mdev_type *type;
167
168		type = add_mdev_supported_type(parent,
169					parent->ops->supported_type_groups[i]);
170		if (IS_ERR(type)) {
171			struct mdev_type *ltype, *tmp;
172
173			list_for_each_entry_safe(ltype, tmp, &parent->type_list,
174						  next) {
175				list_del(&ltype->next);
176				remove_mdev_supported_type(ltype);
177			}
178			return PTR_ERR(type);
179		}
180		list_add(&type->next, &parent->type_list);
181	}
182	return 0;
183}
184
185/* mdev sysfs functions */
186void parent_remove_sysfs_files(struct mdev_parent *parent)
187{
188	struct mdev_type *type, *tmp;
189
190	list_for_each_entry_safe(type, tmp, &parent->type_list, next) {
191		list_del(&type->next);
192		remove_mdev_supported_type(type);
193	}
194
195	sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups);
 
196	kset_unregister(parent->mdev_types_kset);
197}
198
199int parent_create_sysfs_files(struct mdev_parent *parent)
200{
201	int ret;
202
203	parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
204					       NULL, &parent->dev->kobj);
205
206	if (!parent->mdev_types_kset)
207		return -ENOMEM;
208
209	INIT_LIST_HEAD(&parent->type_list);
210
211	ret = sysfs_create_groups(&parent->dev->kobj,
212				  parent->ops->dev_attr_groups);
213	if (ret)
214		goto create_err;
215
216	ret = add_mdev_supported_type_groups(parent);
217	if (ret)
218		sysfs_remove_groups(&parent->dev->kobj,
219				    parent->ops->dev_attr_groups);
220	else
221		return ret;
222
223create_err:
 
 
224	kset_unregister(parent->mdev_types_kset);
225	return ret;
226}
227
228static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
229			    const char *buf, size_t count)
230{
 
231	unsigned long val;
232
233	if (kstrtoul(buf, 0, &val) < 0)
234		return -EINVAL;
235
236	if (val && device_remove_file_self(dev, attr)) {
237		int ret;
238
239		ret = mdev_device_remove(dev, false);
240		if (ret) {
241			device_create_file(dev, attr);
242			return ret;
243		}
244	}
245
246	return count;
247}
248
249static DEVICE_ATTR_WO(remove);
250
251static const struct attribute *mdev_device_attrs[] = {
252	&dev_attr_remove.attr,
253	NULL,
254};
255
256int  mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
 
 
 
 
 
 
 
 
 
257{
 
 
258	int ret;
259
260	ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
261	if (ret)
262		return ret;
263
264	ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
265	if (ret)
266		goto device_link_failed;
267
268	ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
269	if (ret)
270		goto type_link_failed;
271
272	return ret;
273
274type_link_failed:
275	sysfs_remove_link(type->devices_kobj, dev_name(dev));
276device_link_failed:
277	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
278	return ret;
279}
280
281void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
282{
283	sysfs_remove_link(&dev->kobj, "mdev_type");
284	sysfs_remove_link(type->devices_kobj, dev_name(dev));
285	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
 
286}
v6.13.7
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * File attributes for Mediated devices
  4 *
  5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
  6 *     Author: Neo Jia <cjia@nvidia.com>
  7 *             Kirti Wankhede <kwankhede@nvidia.com>
 
 
 
 
  8 */
  9
 10#include <linux/sysfs.h>
 11#include <linux/ctype.h>
 
 12#include <linux/slab.h>
 
 13#include <linux/mdev.h>
 14
 15#include "mdev_private.h"
 16
 17struct mdev_type_attribute {
 18	struct attribute attr;
 19	ssize_t (*show)(struct mdev_type *mtype,
 20			struct mdev_type_attribute *attr, char *buf);
 21	ssize_t (*store)(struct mdev_type *mtype,
 22			 struct mdev_type_attribute *attr, const char *buf,
 23			 size_t count);
 24};
 25
 26#define MDEV_TYPE_ATTR_RO(_name) \
 27	struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name)
 28#define MDEV_TYPE_ATTR_WO(_name) \
 29	struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name)
 30
 31static ssize_t mdev_type_attr_show(struct kobject *kobj,
 32				     struct attribute *__attr, char *buf)
 33{
 34	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
 35	struct mdev_type *type = to_mdev_type(kobj);
 36	ssize_t ret = -EIO;
 37
 38	if (attr->show)
 39		ret = attr->show(type, attr, buf);
 40	return ret;
 41}
 42
 43static ssize_t mdev_type_attr_store(struct kobject *kobj,
 44				      struct attribute *__attr,
 45				      const char *buf, size_t count)
 46{
 47	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
 48	struct mdev_type *type = to_mdev_type(kobj);
 49	ssize_t ret = -EIO;
 50
 51	if (attr->store)
 52		ret = attr->store(type, attr, buf, count);
 53	return ret;
 54}
 55
 56static const struct sysfs_ops mdev_type_sysfs_ops = {
 57	.show = mdev_type_attr_show,
 58	.store = mdev_type_attr_store,
 59};
 60
 61static ssize_t create_store(struct mdev_type *mtype,
 62			    struct mdev_type_attribute *attr, const char *buf,
 63			    size_t count)
 64{
 65	char *str;
 66	guid_t uuid;
 67	int ret;
 68
 69	if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
 70		return -EINVAL;
 71
 72	str = kstrndup(buf, count, GFP_KERNEL);
 73	if (!str)
 74		return -ENOMEM;
 75
 76	ret = guid_parse(str, &uuid);
 77	kfree(str);
 78	if (ret)
 79		return ret;
 80
 81	ret = mdev_device_create(mtype, &uuid);
 82	if (ret)
 83		return ret;
 84
 85	return count;
 86}
 87static MDEV_TYPE_ATTR_WO(create);
 88
 89static ssize_t device_api_show(struct mdev_type *mtype,
 90			       struct mdev_type_attribute *attr, char *buf)
 91{
 92	return sysfs_emit(buf, "%s\n", mtype->parent->mdev_driver->device_api);
 93}
 94static MDEV_TYPE_ATTR_RO(device_api);
 95
 96static ssize_t name_show(struct mdev_type *mtype,
 97			 struct mdev_type_attribute *attr, char *buf)
 98{
 99	return sysfs_emit(buf, "%s\n",
100		mtype->pretty_name ? mtype->pretty_name : mtype->sysfs_name);
101}
102
103static MDEV_TYPE_ATTR_RO(name);
104
105static ssize_t available_instances_show(struct mdev_type *mtype,
106					struct mdev_type_attribute *attr,
107					char *buf)
108{
109	struct mdev_driver *drv = mtype->parent->mdev_driver;
110
111	if (drv->get_available)
112		return sysfs_emit(buf, "%u\n", drv->get_available(mtype));
113	return sysfs_emit(buf, "%u\n",
114			  atomic_read(&mtype->parent->available_instances));
115}
116static MDEV_TYPE_ATTR_RO(available_instances);
117
118static ssize_t description_show(struct mdev_type *mtype,
119				struct mdev_type_attribute *attr,
120				char *buf)
121{
122	return mtype->parent->mdev_driver->show_description(mtype, buf);
123}
124static MDEV_TYPE_ATTR_RO(description);
125
126static struct attribute *mdev_types_core_attrs[] = {
127	&mdev_type_attr_create.attr,
128	&mdev_type_attr_device_api.attr,
129	&mdev_type_attr_name.attr,
130	&mdev_type_attr_available_instances.attr,
131	&mdev_type_attr_description.attr,
132	NULL,
133};
134
135static umode_t mdev_types_core_is_visible(struct kobject *kobj,
136					  struct attribute *attr, int n)
137{
138	if (attr == &mdev_type_attr_description.attr &&
139	    !to_mdev_type(kobj)->parent->mdev_driver->show_description)
140		return 0;
141	return attr->mode;
142}
143
144static struct attribute_group mdev_type_core_group = {
145	.attrs = mdev_types_core_attrs,
146	.is_visible = mdev_types_core_is_visible,
147};
148
149static const struct attribute_group *mdev_type_groups[] = {
150	&mdev_type_core_group,
151	NULL,
152};
153
154static void mdev_type_release(struct kobject *kobj)
155{
156	struct mdev_type *type = to_mdev_type(kobj);
157
158	pr_debug("Releasing group %s\n", kobj->name);
159	/* Pairs with the get in add_mdev_supported_type() */
160	put_device(type->parent->dev);
161}
162
163static const struct kobj_type mdev_type_ktype = {
164	.sysfs_ops	= &mdev_type_sysfs_ops,
165	.release	= mdev_type_release,
166	.default_groups	= mdev_type_groups,
167};
168
169static int mdev_type_add(struct mdev_parent *parent, struct mdev_type *type)
 
170{
 
171	int ret;
172
 
 
 
 
 
 
 
 
 
173	type->kobj.kset = parent->mdev_types_kset;
174	type->parent = parent;
175	/* Pairs with the put in mdev_type_release() */
176	get_device(parent->dev);
177
178	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
179				   "%s-%s", dev_driver_string(parent->dev),
180				   type->sysfs_name);
181	if (ret) {
182		kobject_put(&type->kobj);
183		return ret;
184	}
185
 
 
 
 
186	type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
187	if (!type->devices_kobj) {
188		ret = -ENOMEM;
189		goto attr_devices_failed;
190	}
191
192	return 0;
 
 
 
 
 
 
 
 
 
193
 
 
194attr_devices_failed:
 
 
195	kobject_del(&type->kobj);
196	kobject_put(&type->kobj);
197	return ret;
198}
199
200static void mdev_type_remove(struct mdev_type *type)
201{
 
 
202	kobject_put(type->devices_kobj);
 
203	kobject_del(&type->kobj);
204	kobject_put(&type->kobj);
205}
206
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
207/* mdev sysfs functions */
208void parent_remove_sysfs_files(struct mdev_parent *parent)
209{
210	int i;
 
 
 
 
 
211
212	for (i = 0; i < parent->nr_types; i++)
213		mdev_type_remove(parent->types[i]);
214	kset_unregister(parent->mdev_types_kset);
215}
216
217int parent_create_sysfs_files(struct mdev_parent *parent)
218{
219	int ret, i;
220
221	parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
222					       NULL, &parent->dev->kobj);
 
223	if (!parent->mdev_types_kset)
224		return -ENOMEM;
225
226	for (i = 0; i < parent->nr_types; i++) {
227		ret = mdev_type_add(parent, parent->types[i]);
228		if (ret)
229			goto out_err;
230	}
231	return 0;
 
 
 
 
 
 
 
232
233out_err:
234	while (--i >= 0)
235		mdev_type_remove(parent->types[i]);
236	kset_unregister(parent->mdev_types_kset);
237	return ret;
238}
239
240static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
241			    const char *buf, size_t count)
242{
243	struct mdev_device *mdev = to_mdev_device(dev);
244	unsigned long val;
245
246	if (kstrtoul(buf, 0, &val) < 0)
247		return -EINVAL;
248
249	if (val && device_remove_file_self(dev, attr)) {
250		int ret;
251
252		ret = mdev_device_remove(mdev);
253		if (ret)
 
254			return ret;
 
255	}
256
257	return count;
258}
259
260static DEVICE_ATTR_WO(remove);
261
262static struct attribute *mdev_device_attrs[] = {
263	&dev_attr_remove.attr,
264	NULL,
265};
266
267static const struct attribute_group mdev_device_group = {
268	.attrs = mdev_device_attrs,
269};
270
271const struct attribute_group *mdev_device_groups[] = {
272	&mdev_device_group,
273	NULL
274};
275
276int mdev_create_sysfs_files(struct mdev_device *mdev)
277{
278	struct mdev_type *type = mdev->type;
279	struct kobject *kobj = &mdev->dev.kobj;
280	int ret;
281
282	ret = sysfs_create_link(type->devices_kobj, kobj, dev_name(&mdev->dev));
283	if (ret)
284		return ret;
285
286	ret = sysfs_create_link(kobj, &type->kobj, "mdev_type");
 
 
 
 
287	if (ret)
288		goto type_link_failed;
 
289	return ret;
290
291type_link_failed:
292	sysfs_remove_link(mdev->type->devices_kobj, dev_name(&mdev->dev));
 
 
293	return ret;
294}
295
296void mdev_remove_sysfs_files(struct mdev_device *mdev)
297{
298	struct kobject *kobj = &mdev->dev.kobj;
299
300	sysfs_remove_link(kobj, "mdev_type");
301	sysfs_remove_link(mdev->type->devices_kobj, dev_name(&mdev->dev));
302}