summaryrefslogtreecommitdiffstats
path: root/drivers/vfio/mdev/mdev_sysfs.c
blob: 802df210929ba5d52924c102867cbe55ba365963 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
/*
 * File attributes for Mediated devices
 *
 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
 *     Author: Neo Jia <cjia@nvidia.com>
 *             Kirti Wankhede <kwankhede@nvidia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/mdev.h>

#include "mdev_private.h"

/* Static functions */

static ssize_t mdev_type_attr_show(struct kobject *kobj,
				     struct attribute *__attr, char *buf)
{
	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
	struct mdev_type *type = to_mdev_type(kobj);
	ssize_t ret = -EIO;

	if (attr->show)
		ret = attr->show(kobj, type->parent->dev, buf);
	return ret;
}

static ssize_t mdev_type_attr_store(struct kobject *kobj,
				      struct attribute *__attr,
				      const char *buf, size_t count)
{
	struct mdev_type_attribute *attr = to_mdev_type_attr(__attr);
	struct mdev_type *type = to_mdev_type(kobj);
	ssize_t ret = -EIO;

	if (attr->store)
		ret = attr->store(&type->kobj, type->parent->dev, buf, count);
	return ret;
}

static const struct sysfs_ops mdev_type_sysfs_ops = {
	.show = mdev_type_attr_show,
	.store = mdev_type_attr_store,
};

static ssize_t create_store(struct kobject *kobj, struct device *dev,
			    const char *buf, size_t count)
{
	char *str;
	uuid_le uuid;
	int ret;

	if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
		return -EINVAL;

	str = kstrndup(buf, count, GFP_KERNEL);
	if (!str)
		return -ENOMEM;

	ret = uuid_le_to_bin(str, &uuid);
	kfree(str);
	if (ret)
		return ret;

	ret = mdev_device_create(kobj, dev, uuid);
	if (ret)
		return ret;

	return count;
}

MDEV_TYPE_ATTR_WO(create);

static void mdev_type_release(struct kobject *kobj)
{
	struct mdev_type *type = to_mdev_type(kobj);

	pr_debug("Releasing group %s\n", kobj->name);
	kfree(type);
}

static struct kobj_type mdev_type_ktype = {
	.sysfs_ops = &mdev_type_sysfs_ops,
	.release = mdev_type_release,
};

struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
					  struct attribute_group *group)
{
	struct mdev_type *type;
	int ret;

	if (!group->name) {
		pr_err("%s: Type name empty!\n", __func__);
		return ERR_PTR(-EINVAL);
	}

	type = kzalloc(sizeof(*type), GFP_KERNEL);
	if (!type)
		return ERR_PTR(-ENOMEM);

	type->kobj.kset = parent->mdev_types_kset;

	ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
				   "%s-%s", dev_driver_string(parent->dev),
				   group->name);
	if (ret) {
		kfree(type);
		return ERR_PTR(ret);
	}

	ret = sysfs_create_file(&type->kobj, &mdev_type_attr_create.attr);
	if (ret)
		goto attr_create_failed;

	type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
	if (!type->devices_kobj) {
		ret = -ENOMEM;
		goto attr_devices_failed;
	}

	ret = sysfs_create_files(&type->kobj,
				 (const struct attribute **)group->attrs);
	if (ret) {
		ret = -ENOMEM;
		goto attrs_failed;
	}

	type->group = group;
	type->parent = parent;
	return type;

attrs_failed:
	kobject_put(type->devices_kobj);
attr_devices_failed:
	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
attr_create_failed:
	kobject_del(&type->kobj);
	kobject_put(&type->kobj);
	return ERR_PTR(ret);
}

static void remove_mdev_supported_type(struct mdev_type *type)
{
	sysfs_remove_files(&type->kobj,
			   (const struct attribute **)type->group->attrs);
	kobject_put(type->devices_kobj);
	sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
	kobject_del(&type->kobj);
	kobject_put(&type->kobj);
}

static int add_mdev_supported_type_groups(struct mdev_parent *parent)
{
	int i;

	for (i = 0; parent->ops->supported_type_groups[i]; i++) {
		struct mdev_type *type;

		type = add_mdev_supported_type(parent,
					parent->ops->supported_type_groups[i]);
		if (IS_ERR(type)) {
			struct mdev_type *ltype, *tmp;

			list_for_each_entry_safe(ltype, tmp, &parent->type_list,
						  next) {
				list_del(&ltype->next);
				remove_mdev_supported_type(ltype);
			}
			return PTR_ERR(type);
		}
		list_add(&type->next, &parent->type_list);
	}
	return 0;
}

/* mdev sysfs functions */
void parent_remove_sysfs_files(struct mdev_parent *parent)
{
	struct mdev_type *type, *tmp;

	list_for_each_entry_safe(type, tmp, &parent->type_list, next) {
		list_del(&type->next);
		remove_mdev_supported_type(type);
	}

	sysfs_remove_groups(&parent->dev->kobj, parent->ops->dev_attr_groups);
	kset_unregister(parent->mdev_types_kset);
}

int parent_create_sysfs_files(struct mdev_parent *parent)
{
	int ret;

	parent->mdev_types_kset = kset_create_and_add("mdev_supported_types",
					       NULL, &parent->dev->kobj);

	if (!parent->mdev_types_kset)
		return -ENOMEM;

	INIT_LIST_HEAD(&parent->type_list);

	ret = sysfs_create_groups(&parent->dev->kobj,
				  parent->ops->dev_attr_groups);
	if (ret)
		goto create_err;

	ret = add_mdev_supported_type_groups(parent);
	if (ret)
		sysfs_remove_groups(&parent->dev->kobj,
				    parent->ops->dev_attr_groups);
	else
		return ret;

create_err:
	kset_unregister(parent->mdev_types_kset);
	return ret;
}

static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	unsigned long val;

	if (kstrtoul(buf, 0, &val) < 0)
		return -EINVAL;

	if (val && device_remove_file_self(dev, attr)) {
		int ret;

		ret = mdev_device_remove(dev, false);
		if (ret) {
			device_create_file(dev, attr);
			return ret;
		}
	}

	return count;
}

static DEVICE_ATTR_WO(remove);

static const struct attribute *mdev_device_attrs[] = {
	&dev_attr_remove.attr,
	NULL,
};

int  mdev_create_sysfs_files(struct device *dev, struct mdev_type *type)
{
	int ret;

	ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
	if (ret)
		return ret;

	ret = sysfs_create_link(type->devices_kobj, &dev->kobj, dev_name(dev));
	if (ret)
		goto device_link_failed;

	ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
	if (ret)
		goto type_link_failed;

	return ret;

type_link_failed:
	sysfs_remove_link(type->devices_kobj, dev_name(dev));
device_link_failed:
	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
	return ret;
}

void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
{
	sysfs_remove_link(&dev->kobj, "mdev_type");
	sysfs_remove_link(type->devices_kobj, dev_name(dev));
	sysfs_remove_files(&dev->kobj, mdev_device_attrs);
}