[mirror_ubuntu-hirsute-kernel.git] / drivers / vfio / mdev / mdev_core.c

/*
 * Mediated device Core Driver
 *
 * 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/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/uuid.h>
#include <linux/sysfs.h>
#include <linux/mdev.h>

#include "mdev_private.h"

#define DRIVER_VERSION		"0.1"
#define DRIVER_AUTHOR		"NVIDIA Corporation"
#define DRIVER_DESC		"Mediated device Core Driver"

static LIST_HEAD(parent_list);
static DEFINE_MUTEX(parent_list_lock);
static struct class_compat *mdev_bus_compat_class;

static LIST_HEAD(mdev_list);
static DEFINE_MUTEX(mdev_list_lock);

struct device *mdev_parent_dev(struct mdev_device *mdev)
{
	return mdev->parent->dev;
}
EXPORT_SYMBOL(mdev_parent_dev);

void *mdev_get_drvdata(struct mdev_device *mdev)
{
	return mdev->driver_data;
}
EXPORT_SYMBOL(mdev_get_drvdata);

void mdev_set_drvdata(struct mdev_device *mdev, void *data)
{
	mdev->driver_data = data;
}
EXPORT_SYMBOL(mdev_set_drvdata);

struct device *mdev_dev(struct mdev_device *mdev)
{
	return &mdev->dev;
}
EXPORT_SYMBOL(mdev_dev);

struct mdev_device *mdev_from_dev(struct device *dev)
{
	return dev_is_mdev(dev) ? to_mdev_device(dev) : NULL;
}
EXPORT_SYMBOL(mdev_from_dev);

const guid_t *mdev_uuid(struct mdev_device *mdev)
{
	return &mdev->uuid;
}
EXPORT_SYMBOL(mdev_uuid);

/* Should be called holding parent_list_lock */
static struct mdev_parent *__find_parent_device(struct device *dev)
{
	struct mdev_parent *parent;

	list_for_each_entry(parent, &parent_list, next) {
		if (parent->dev == dev)
			return parent;
	}
	return NULL;
}

static void mdev_release_parent(struct kref *kref)
{
	struct mdev_parent *parent = container_of(kref, struct mdev_parent,
						  ref);
	struct device *dev = parent->dev;

	kfree(parent);
	put_device(dev);
}

static inline struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)
{
	if (parent)
		kref_get(&parent->ref);

	return parent;
}

static inline void mdev_put_parent(struct mdev_parent *parent)
{
	if (parent)
		kref_put(&parent->ref, mdev_release_parent);
}

static int mdev_device_create_ops(struct kobject *kobj,
				  struct mdev_device *mdev)
{
	struct mdev_parent *parent = mdev->parent;
	int ret;

	ret = parent->ops->create(kobj, mdev);
	if (ret)
		return ret;

	ret = sysfs_create_groups(&mdev->dev.kobj,
				  parent->ops->mdev_attr_groups);
	if (ret)
		parent->ops->remove(mdev);

	return ret;
}

/*
 * mdev_device_remove_ops gets called from sysfs's 'remove' and when parent
 * device is being unregistered from mdev device framework.
 * - 'force_remove' is set to 'false' when called from sysfs's 'remove' which
 *   indicates that if the mdev device is active, used by VMM or userspace
 *   application, vendor driver could return error then don't remove the device.
 * - 'force_remove' is set to 'true' when called from mdev_unregister_device()
 *   which indicate that parent device is being removed from mdev device
 *   framework so remove mdev device forcefully.
 */
static int mdev_device_remove_ops(struct mdev_device *mdev, bool force_remove)
{
	struct mdev_parent *parent = mdev->parent;
	int ret;

	/*
	 * Vendor driver can return error if VMM or userspace application is
	 * using this mdev device.
	 */
	ret = parent->ops->remove(mdev);
	if (ret && !force_remove)
		return -EBUSY;

	sysfs_remove_groups(&mdev->dev.kobj, parent->ops->mdev_attr_groups);
	return 0;
}

static int mdev_device_remove_cb(struct device *dev, void *data)
{
	if (!dev_is_mdev(dev))
		return 0;

	return mdev_device_remove(dev, data ? *(bool *)data : true);
}

/*
 * mdev_register_device : Register a device
 * @dev: device structure representing parent device.
 * @ops: Parent device operation structure to be registered.
 *
 * Add device to list of registered parent devices.
 * Returns a negative value on error, otherwise 0.
 */
int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
{
	int ret;
	struct mdev_parent *parent;

	/* check for mandatory ops */
	if (!ops || !ops->create || !ops->remove || !ops->supported_type_groups)
		return -EINVAL;

	dev = get_device(dev);
	if (!dev)
		return -EINVAL;

	mutex_lock(&parent_list_lock);

	/* Check for duplicate */
	parent = __find_parent_device(dev);
	if (parent) {
		ret = -EEXIST;
		goto add_dev_err;
	}

	parent = kzalloc(sizeof(*parent), GFP_KERNEL);
	if (!parent) {
		ret = -ENOMEM;
		goto add_dev_err;
	}

	kref_init(&parent->ref);

	parent->dev = dev;
	parent->ops = ops;

	if (!mdev_bus_compat_class) {
		mdev_bus_compat_class = class_compat_register("mdev_bus");
		if (!mdev_bus_compat_class) {
			ret = -ENOMEM;
			goto add_dev_err;
		}
	}

	ret = parent_create_sysfs_files(parent);
	if (ret)
		goto add_dev_err;

	ret = class_compat_create_link(mdev_bus_compat_class, dev, NULL);
	if (ret)
		dev_warn(dev, "Failed to create compatibility class link\n");

	list_add(&parent->next, &parent_list);
	mutex_unlock(&parent_list_lock);

	dev_info(dev, "MDEV: Registered\n");
	return 0;

add_dev_err:
	mutex_unlock(&parent_list_lock);
	if (parent)
		mdev_put_parent(parent);
	else
		put_device(dev);
	return ret;
}
EXPORT_SYMBOL(mdev_register_device);

/*
 * mdev_unregister_device : Unregister a parent device
 * @dev: device structure representing parent device.
 *
 * Remove device from list of registered parent devices. Give a chance to free
 * existing mediated devices for given device.
 */

void mdev_unregister_device(struct device *dev)
{
	struct mdev_parent *parent;
	bool force_remove = true;

	mutex_lock(&parent_list_lock);
	parent = __find_parent_device(dev);

	if (!parent) {
		mutex_unlock(&parent_list_lock);
		return;
	}
	dev_info(dev, "MDEV: Unregistering\n");

	list_del(&parent->next);
	class_compat_remove_link(mdev_bus_compat_class, dev, NULL);

	device_for_each_child(dev, (void *)&force_remove,
			      mdev_device_remove_cb);

	parent_remove_sysfs_files(parent);

	mutex_unlock(&parent_list_lock);
	mdev_put_parent(parent);
}
EXPORT_SYMBOL(mdev_unregister_device);

static void mdev_device_release(struct device *dev)
{
	struct mdev_device *mdev = to_mdev_device(dev);

	mutex_lock(&mdev_list_lock);
	list_del(&mdev->next);
	mutex_unlock(&mdev_list_lock);

	dev_dbg(&mdev->dev, "MDEV: destroying\n");
	kfree(mdev);
}

int mdev_device_create(struct kobject *kobj,
		       struct device *dev, const guid_t *uuid)
{
	int ret;
	struct mdev_device *mdev, *tmp;
	struct mdev_parent *parent;
	struct mdev_type *type = to_mdev_type(kobj);

	parent = mdev_get_parent(type->parent);
	if (!parent)
		return -EINVAL;

	mutex_lock(&mdev_list_lock);

	/* Check for duplicate */
	list_for_each_entry(tmp, &mdev_list, next) {
		if (guid_equal(&tmp->uuid, uuid)) {
			mutex_unlock(&mdev_list_lock);
			ret = -EEXIST;
			goto mdev_fail;
		}
	}

	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	if (!mdev) {
		mutex_unlock(&mdev_list_lock);
		ret = -ENOMEM;
		goto mdev_fail;
	}

	guid_copy(&mdev->uuid, uuid);
	list_add(&mdev->next, &mdev_list);
	mutex_unlock(&mdev_list_lock);

	mdev->parent = parent;
	kref_init(&mdev->ref);

	mdev->dev.parent  = dev;
	mdev->dev.bus     = &mdev_bus_type;
	mdev->dev.release = mdev_device_release;
	dev_set_name(&mdev->dev, "%pUl", uuid);

	ret = device_register(&mdev->dev);
	if (ret) {
		put_device(&mdev->dev);
		goto mdev_fail;
	}

	ret = mdev_device_create_ops(kobj, mdev);
	if (ret)
		goto create_fail;

	ret = mdev_create_sysfs_files(&mdev->dev, type);
	if (ret) {
		mdev_device_remove_ops(mdev, true);
		goto create_fail;
	}

	mdev->type_kobj = kobj;
	mdev->active = true;
	dev_dbg(&mdev->dev, "MDEV: created\n");

	return 0;

create_fail:
	device_unregister(&mdev->dev);
mdev_fail:
	mdev_put_parent(parent);
	return ret;
}

int mdev_device_remove(struct device *dev, bool force_remove)
{
	struct mdev_device *mdev, *tmp;
	struct mdev_parent *parent;
	struct mdev_type *type;
	int ret;

	mdev = to_mdev_device(dev);

	mutex_lock(&mdev_list_lock);
	list_for_each_entry(tmp, &mdev_list, next) {
		if (tmp == mdev)
			break;
	}

	if (tmp != mdev) {
		mutex_unlock(&mdev_list_lock);
		return -ENODEV;
	}

	if (!mdev->active) {
		mutex_unlock(&mdev_list_lock);
		return -EAGAIN;
	}

	mdev->active = false;
	mutex_unlock(&mdev_list_lock);

	type = to_mdev_type(mdev->type_kobj);
	parent = mdev->parent;

	ret = mdev_device_remove_ops(mdev, force_remove);
	if (ret) {
		mdev->active = true;
		return ret;
	}

	mdev_remove_sysfs_files(dev, type);
	device_unregister(dev);
	mdev_put_parent(parent);

	return 0;
}

static int __init mdev_init(void)
{
	return mdev_bus_register();
}

static void __exit mdev_exit(void)
{
	if (mdev_bus_compat_class)
		class_compat_unregister(mdev_bus_compat_class);

	mdev_bus_unregister();
}

module_init(mdev_init)
module_exit(mdev_exit)

MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_SOFTDEP("post: vfio_mdev");
Commit	Line	Data
7b96953b KW	1	/*
	2	* Mediated device Core Driver
	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/module.h>
	14	#include <linux/device.h>
	15	#include <linux/slab.h>
	16	#include <linux/uuid.h>
	17	#include <linux/sysfs.h>
	18	#include <linux/mdev.h>
	19
	20	#include "mdev_private.h"
	21
	22	#define DRIVER_VERSION "0.1"
	23	#define DRIVER_AUTHOR "NVIDIA Corporation"
	24	#define DRIVER_DESC "Mediated device Core Driver"
	25
	26	static LIST_HEAD(parent_list);
	27	static DEFINE_MUTEX(parent_list_lock);
	28	static struct class_compat *mdev_bus_compat_class;
	29
49550787 AW	30	static LIST_HEAD(mdev_list);
	31	static DEFINE_MUTEX(mdev_list_lock);
	32
9372e6fe AW	33	struct device mdev_parent_dev(struct mdev_device mdev)
	34	{
	35	return mdev->parent->dev;
	36	}
	37	EXPORT_SYMBOL(mdev_parent_dev);
	38
99e3123e AW	39	void mdev_get_drvdata(struct mdev_device mdev)
	40	{
	41	return mdev->driver_data;
	42	}
	43	EXPORT_SYMBOL(mdev_get_drvdata);
	44
	45	void mdev_set_drvdata(struct mdev_device mdev, void data)
	46	{
	47	mdev->driver_data = data;
	48	}
	49	EXPORT_SYMBOL(mdev_set_drvdata);
	50
	51	struct device mdev_dev(struct mdev_device mdev)
	52	{
	53	return &mdev->dev;
	54	}
	55	EXPORT_SYMBOL(mdev_dev);
	56
	57	struct mdev_device mdev_from_dev(struct device dev)
	58	{
	59	return dev_is_mdev(dev) ? to_mdev_device(dev) : NULL;
	60	}
	61	EXPORT_SYMBOL(mdev_from_dev);
	62
278bca7f	63	const guid_t mdev_uuid(struct mdev_device mdev)
99e3123e	64	{
278bca7f	65	return &mdev->uuid;
99e3123e AW	66	}
	67	EXPORT_SYMBOL(mdev_uuid);
	68
7b96953b	69	/* Should be called holding parent_list_lock */
42930553	70	static struct mdev_parent __find_parent_device(struct device dev)
7b96953b	71	{
42930553	72	struct mdev_parent *parent;
7b96953b KW	73
	74	list_for_each_entry(parent, &parent_list, next) {
	75	if (parent->dev == dev)
	76	return parent;
	77	}
	78	return NULL;
	79	}
	80
	81	static void mdev_release_parent(struct kref *kref)
	82	{
42930553 AW	83	struct mdev_parent *parent = container_of(kref, struct mdev_parent,
42930553 AW	84	ref);
7b96953b KW	85	struct device *dev = parent->dev;
	86
	87	kfree(parent);
	88	put_device(dev);
	89	}
	90
278bca7f	91	static inline struct mdev_parent mdev_get_parent(struct mdev_parent parent)
7b96953b KW	92	{
	93	if (parent)
	94	kref_get(&parent->ref);
	95
	96	return parent;
	97	}
	98
42930553	99	static inline void mdev_put_parent(struct mdev_parent *parent)
7b96953b KW	100	{
	101	if (parent)
	102	kref_put(&parent->ref, mdev_release_parent);
	103	}
	104
	105	static int mdev_device_create_ops(struct kobject *kobj,
	106	struct mdev_device *mdev)
	107	{
42930553	108	struct mdev_parent *parent = mdev->parent;
7b96953b KW	109	int ret;
	110
	111	ret = parent->ops->create(kobj, mdev);
	112	if (ret)
	113	return ret;
	114
	115	ret = sysfs_create_groups(&mdev->dev.kobj,
	116	parent->ops->mdev_attr_groups);
	117	if (ret)
	118	parent->ops->remove(mdev);
	119
	120	return ret;
	121	}
	122
	123	/*
	124	* mdev_device_remove_ops gets called from sysfs's 'remove' and when parent
	125	* device is being unregistered from mdev device framework.
	126	* - 'force_remove' is set to 'false' when called from sysfs's 'remove' which
	127	* indicates that if the mdev device is active, used by VMM or userspace
	128	* application, vendor driver could return error then don't remove the device.
	129	* - 'force_remove' is set to 'true' when called from mdev_unregister_device()
	130	* which indicate that parent device is being removed from mdev device
	131	* framework so remove mdev device forcefully.
	132	*/
	133	static int mdev_device_remove_ops(struct mdev_device *mdev, bool force_remove)
	134	{
42930553	135	struct mdev_parent *parent = mdev->parent;
7b96953b KW	136	int ret;
	137
	138	/*
	139	* Vendor driver can return error if VMM or userspace application is
	140	* using this mdev device.
	141	*/
	142	ret = parent->ops->remove(mdev);
	143	if (ret && !force_remove)
	144	return -EBUSY;
	145
	146	sysfs_remove_groups(&mdev->dev.kobj, parent->ops->mdev_attr_groups);
	147	return 0;
	148	}
	149
	150	static int mdev_device_remove_cb(struct device dev, void data)
	151	{
	152	if (!dev_is_mdev(dev))
	153	return 0;
	154
	155	return mdev_device_remove(dev, data ? (bool )data : true);
	156	}
	157
	158	/*
	159	* mdev_register_device : Register a device
	160	* @dev: device structure representing parent device.
	161	* @ops: Parent device operation structure to be registered.
	162	*
	163	* Add device to list of registered parent devices.
	164	* Returns a negative value on error, otherwise 0.
	165	*/
42930553	166	int mdev_register_device(struct device dev, const struct mdev_parent_ops ops)
7b96953b KW	167	{
7b96953b KW	168	int ret;
42930553	169	struct mdev_parent *parent;
7b96953b KW	170
	171	/* check for mandatory ops */
	172	if (!ops \|\| !ops->create \|\| !ops->remove \|\| !ops->supported_type_groups)
	173	return -EINVAL;
	174
	175	dev = get_device(dev);
	176	if (!dev)
	177	return -EINVAL;
	178
	179	mutex_lock(&parent_list_lock);
	180
	181	/* Check for duplicate */
	182	parent = __find_parent_device(dev);
	183	if (parent) {
	184	ret = -EEXIST;
	185	goto add_dev_err;
	186	}
	187
	188	parent = kzalloc(sizeof(*parent), GFP_KERNEL);
	189	if (!parent) {
	190	ret = -ENOMEM;
	191	goto add_dev_err;
	192	}
	193
	194	kref_init(&parent->ref);
7b96953b KW	195
	196	parent->dev = dev;
	197	parent->ops = ops;
	198
	199	if (!mdev_bus_compat_class) {
	200	mdev_bus_compat_class = class_compat_register("mdev_bus");
	201	if (!mdev_bus_compat_class) {
	202	ret = -ENOMEM;
	203	goto add_dev_err;
	204	}
	205	}
	206
	207	ret = parent_create_sysfs_files(parent);
	208	if (ret)
	209	goto add_dev_err;
	210
	211	ret = class_compat_create_link(mdev_bus_compat_class, dev, NULL);
	212	if (ret)
	213	dev_warn(dev, "Failed to create compatibility class link\n");
	214
	215	list_add(&parent->next, &parent_list);
	216	mutex_unlock(&parent_list_lock);
	217
	218	dev_info(dev, "MDEV: Registered\n");
	219	return 0;
	220
	221	add_dev_err:
	222	mutex_unlock(&parent_list_lock);
	223	if (parent)
	224	mdev_put_parent(parent);
	225	else
	226	put_device(dev);
	227	return ret;
	228	}
	229	EXPORT_SYMBOL(mdev_register_device);
	230
	231	/*
	232	* mdev_unregister_device : Unregister a parent device
	233	* @dev: device structure representing parent device.
	234	*
	235	* Remove device from list of registered parent devices. Give a chance to free
	236	* existing mediated devices for given device.
	237	*/
	238
	239	void mdev_unregister_device(struct device *dev)
	240	{
42930553	241	struct mdev_parent *parent;
7b96953b KW	242	bool force_remove = true;
	243
	244	mutex_lock(&parent_list_lock);
	245	parent = __find_parent_device(dev);
	246
	247	if (!parent) {
	248	mutex_unlock(&parent_list_lock);
	249	return;
	250	}
	251	dev_info(dev, "MDEV: Unregistering\n");
	252
	253	list_del(&parent->next);
	254	class_compat_remove_link(mdev_bus_compat_class, dev, NULL);
	255
	256	device_for_each_child(dev, (void *)&force_remove,
	257	mdev_device_remove_cb);
	258
	259	parent_remove_sysfs_files(parent);
	260
	261	mutex_unlock(&parent_list_lock);
	262	mdev_put_parent(parent);
	263	}
	264	EXPORT_SYMBOL(mdev_unregister_device);
	265
	266	static void mdev_device_release(struct device *dev)
	267	{
	268	struct mdev_device *mdev = to_mdev_device(dev);
	269
002fe996 AW	270	mutex_lock(&mdev_list_lock);
	271	list_del(&mdev->next);
	272	mutex_unlock(&mdev_list_lock);
	273
7b96953b KW	274	dev_dbg(&mdev->dev, "MDEV: destroying\n");
	275	kfree(mdev);
	276	}
	277
278bca7f AS	278	int mdev_device_create(struct kobject *kobj,
278bca7f AS	279	struct device dev, const guid_t uuid)
7b96953b KW	280	{
7b96953b KW	281	int ret;
002fe996	282	struct mdev_device mdev, tmp;
42930553	283	struct mdev_parent *parent;
7b96953b KW	284	struct mdev_type *type = to_mdev_type(kobj);
	285
	286	parent = mdev_get_parent(type->parent);
	287	if (!parent)
	288	return -EINVAL;
	289
002fe996	290	mutex_lock(&mdev_list_lock);
7b96953b KW	291
7b96953b KW	292	/* Check for duplicate */
002fe996	293	list_for_each_entry(tmp, &mdev_list, next) {
278bca7f	294	if (guid_equal(&tmp->uuid, uuid)) {
002fe996 AW	295	mutex_unlock(&mdev_list_lock);
	296	ret = -EEXIST;
	297	goto mdev_fail;
	298	}
7b96953b KW	299	}
	300
	301	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	302	if (!mdev) {
002fe996	303	mutex_unlock(&mdev_list_lock);
7b96953b	304	ret = -ENOMEM;
002fe996	305	goto mdev_fail;
7b96953b KW	306	}
7b96953b KW	307
278bca7f	308	guid_copy(&mdev->uuid, uuid);
002fe996 AW	309	list_add(&mdev->next, &mdev_list);
	310	mutex_unlock(&mdev_list_lock);
	311
7b96953b KW	312	mdev->parent = parent;
	313	kref_init(&mdev->ref);
	314
	315	mdev->dev.parent = dev;
	316	mdev->dev.bus = &mdev_bus_type;
	317	mdev->dev.release = mdev_device_release;
278bca7f	318	dev_set_name(&mdev->dev, "%pUl", uuid);
7b96953b KW	319
	320	ret = device_register(&mdev->dev);
	321	if (ret) {
	322	put_device(&mdev->dev);
002fe996	323	goto mdev_fail;
7b96953b KW	324	}
	325
	326	ret = mdev_device_create_ops(kobj, mdev);
	327	if (ret)
002fe996	328	goto create_fail;
7b96953b KW	329
	330	ret = mdev_create_sysfs_files(&mdev->dev, type);
	331	if (ret) {
	332	mdev_device_remove_ops(mdev, true);
002fe996	333	goto create_fail;
7b96953b KW	334	}
	335
	336	mdev->type_kobj = kobj;
002fe996	337	mdev->active = true;
7b96953b KW	338	dev_dbg(&mdev->dev, "MDEV: created\n");
7b96953b KW	339
002fe996	340	return 0;
7b96953b	341
002fe996	342	create_fail:
7b96953b	343	device_unregister(&mdev->dev);
002fe996	344	mdev_fail:
7b96953b KW	345	mdev_put_parent(parent);
	346	return ret;
	347	}
	348
	349	int mdev_device_remove(struct device *dev, bool force_remove)
	350	{
49550787	351	struct mdev_device mdev, tmp;
42930553	352	struct mdev_parent *parent;
7b96953b KW	353	struct mdev_type *type;
	354	int ret;
	355
	356	mdev = to_mdev_device(dev);
49550787 AW	357
	358	mutex_lock(&mdev_list_lock);
	359	list_for_each_entry(tmp, &mdev_list, next) {
002fe996	360	if (tmp == mdev)
49550787	361	break;
49550787 AW	362	}
49550787 AW	363
002fe996 AW	364	if (tmp != mdev) {
	365	mutex_unlock(&mdev_list_lock);
	366	return -ENODEV;
	367	}
49550787	368
002fe996 AW	369	if (!mdev->active) {
	370	mutex_unlock(&mdev_list_lock);
	371	return -EAGAIN;
	372	}
49550787	373
002fe996 AW	374	mdev->active = false;
002fe996 AW	375	mutex_unlock(&mdev_list_lock);
49550787	376
7b96953b KW	377	type = to_mdev_type(mdev->type_kobj);
7b96953b KW	378	parent = mdev->parent;
7b96953b KW	379
	380	ret = mdev_device_remove_ops(mdev, force_remove);
	381	if (ret) {
002fe996	382	mdev->active = true;
7b96953b KW	383	return ret;
	384	}
	385
	386	mdev_remove_sysfs_files(dev, type);
	387	device_unregister(dev);
7b96953b	388	mdev_put_parent(parent);
49550787 AW	389
49550787 AW	390	return 0;
7b96953b KW	391	}
	392
	393	static int __init mdev_init(void)
	394	{
f790eb57	395	return mdev_bus_register();
7b96953b KW	396	}
	397
	398	static void __exit mdev_exit(void)
	399	{
	400	if (mdev_bus_compat_class)
	401	class_compat_unregister(mdev_bus_compat_class);
	402
	403	mdev_bus_unregister();
	404	}
	405
	406	module_init(mdev_init)
	407	module_exit(mdev_exit)
	408
	409	MODULE_VERSION(DRIVER_VERSION);
	410	MODULE_LICENSE("GPL v2");
	411	MODULE_AUTHOR(DRIVER_AUTHOR);
	412	MODULE_DESCRIPTION(DRIVER_DESC);
f790eb57	413	MODULE_SOFTDEP("post: vfio_mdev");