[mirror_ubuntu-bionic-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);

uuid_le 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) {
		parent = NULL;
		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, uuid_le 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 (!uuid_le_cmp(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;
	}

	memcpy(&mdev->uuid, &uuid, sizeof(uuid_le));
	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.b);

	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
	63	uuid_le mdev_uuid(struct mdev_device *mdev)
	64	{
	65	return mdev->uuid;
	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
	91	static
42930553	92	inline struct mdev_parent mdev_get_parent(struct mdev_parent parent)
7b96953b KW	93	{
	94	if (parent)
	95	kref_get(&parent->ref);
	96
	97	return parent;
	98	}
	99
42930553	100	static inline void mdev_put_parent(struct mdev_parent *parent)
7b96953b KW	101	{
	102	if (parent)
	103	kref_put(&parent->ref, mdev_release_parent);
	104	}
	105
	106	static int mdev_device_create_ops(struct kobject *kobj,
	107	struct mdev_device *mdev)
	108	{
42930553	109	struct mdev_parent *parent = mdev->parent;
7b96953b KW	110	int ret;
	111
	112	ret = parent->ops->create(kobj, mdev);
	113	if (ret)
	114	return ret;
	115
	116	ret = sysfs_create_groups(&mdev->dev.kobj,
	117	parent->ops->mdev_attr_groups);
	118	if (ret)
	119	parent->ops->remove(mdev);
	120
	121	return ret;
	122	}
	123
	124	/*
	125	* mdev_device_remove_ops gets called from sysfs's 'remove' and when parent
	126	* device is being unregistered from mdev device framework.
	127	* - 'force_remove' is set to 'false' when called from sysfs's 'remove' which
	128	* indicates that if the mdev device is active, used by VMM or userspace
	129	* application, vendor driver could return error then don't remove the device.
	130	* - 'force_remove' is set to 'true' when called from mdev_unregister_device()
	131	* which indicate that parent device is being removed from mdev device
	132	* framework so remove mdev device forcefully.
	133	*/
	134	static int mdev_device_remove_ops(struct mdev_device *mdev, bool force_remove)
	135	{
42930553	136	struct mdev_parent *parent = mdev->parent;
7b96953b KW	137	int ret;
	138
	139	/*
	140	* Vendor driver can return error if VMM or userspace application is
	141	* using this mdev device.
	142	*/
	143	ret = parent->ops->remove(mdev);
	144	if (ret && !force_remove)
	145	return -EBUSY;
	146
	147	sysfs_remove_groups(&mdev->dev.kobj, parent->ops->mdev_attr_groups);
	148	return 0;
	149	}
	150
	151	static int mdev_device_remove_cb(struct device dev, void data)
	152	{
	153	if (!dev_is_mdev(dev))
	154	return 0;
	155
	156	return mdev_device_remove(dev, data ? (bool )data : true);
	157	}
	158
	159	/*
	160	* mdev_register_device : Register a device
	161	* @dev: device structure representing parent device.
	162	* @ops: Parent device operation structure to be registered.
	163	*
	164	* Add device to list of registered parent devices.
	165	* Returns a negative value on error, otherwise 0.
	166	*/
42930553	167	int mdev_register_device(struct device dev, const struct mdev_parent_ops ops)
7b96953b KW	168	{
7b96953b KW	169	int ret;
42930553	170	struct mdev_parent *parent;
7b96953b KW	171
	172	/* check for mandatory ops */
	173	if (!ops \|\| !ops->create \|\| !ops->remove \|\| !ops->supported_type_groups)
	174	return -EINVAL;
	175
	176	dev = get_device(dev);
	177	if (!dev)
	178	return -EINVAL;
	179
	180	mutex_lock(&parent_list_lock);
	181
	182	/* Check for duplicate */
	183	parent = __find_parent_device(dev);
	184	if (parent) {
89079cc1	185	parent = NULL;
7b96953b KW	186	ret = -EEXIST;
	187	goto add_dev_err;
	188	}
	189
	190	parent = kzalloc(sizeof(*parent), GFP_KERNEL);
	191	if (!parent) {
	192	ret = -ENOMEM;
	193	goto add_dev_err;
	194	}
	195
	196	kref_init(&parent->ref);
7b96953b KW	197
	198	parent->dev = dev;
	199	parent->ops = ops;
	200
	201	if (!mdev_bus_compat_class) {
	202	mdev_bus_compat_class = class_compat_register("mdev_bus");
	203	if (!mdev_bus_compat_class) {
	204	ret = -ENOMEM;
	205	goto add_dev_err;
	206	}
	207	}
	208
	209	ret = parent_create_sysfs_files(parent);
	210	if (ret)
	211	goto add_dev_err;
	212
	213	ret = class_compat_create_link(mdev_bus_compat_class, dev, NULL);
	214	if (ret)
	215	dev_warn(dev, "Failed to create compatibility class link\n");
	216
	217	list_add(&parent->next, &parent_list);
	218	mutex_unlock(&parent_list_lock);
	219
	220	dev_info(dev, "MDEV: Registered\n");
	221	return 0;
	222
	223	add_dev_err:
	224	mutex_unlock(&parent_list_lock);
	225	if (parent)
	226	mdev_put_parent(parent);
	227	else
	228	put_device(dev);
	229	return ret;
	230	}
	231	EXPORT_SYMBOL(mdev_register_device);
	232
	233	/*
	234	* mdev_unregister_device : Unregister a parent device
	235	* @dev: device structure representing parent device.
	236	*
	237	* Remove device from list of registered parent devices. Give a chance to free
	238	* existing mediated devices for given device.
	239	*/
	240
	241	void mdev_unregister_device(struct device *dev)
	242	{
42930553	243	struct mdev_parent *parent;
7b96953b KW	244	bool force_remove = true;
	245
	246	mutex_lock(&parent_list_lock);
	247	parent = __find_parent_device(dev);
	248
	249	if (!parent) {
	250	mutex_unlock(&parent_list_lock);
	251	return;
	252	}
	253	dev_info(dev, "MDEV: Unregistering\n");
	254
	255	list_del(&parent->next);
	256	class_compat_remove_link(mdev_bus_compat_class, dev, NULL);
	257
	258	device_for_each_child(dev, (void *)&force_remove,
	259	mdev_device_remove_cb);
	260
	261	parent_remove_sysfs_files(parent);
	262
	263	mutex_unlock(&parent_list_lock);
	264	mdev_put_parent(parent);
	265	}
	266	EXPORT_SYMBOL(mdev_unregister_device);
	267
	268	static void mdev_device_release(struct device *dev)
	269	{
	270	struct mdev_device *mdev = to_mdev_device(dev);
	271
59bbf783 AW	272	mutex_lock(&mdev_list_lock);
	273	list_del(&mdev->next);
	274	mutex_unlock(&mdev_list_lock);
	275
7b96953b KW	276	dev_dbg(&mdev->dev, "MDEV: destroying\n");
	277	kfree(mdev);
	278	}
	279
	280	int mdev_device_create(struct kobject kobj, struct device dev, uuid_le uuid)
	281	{
	282	int ret;
59bbf783	283	struct mdev_device mdev, tmp;
42930553	284	struct mdev_parent *parent;
7b96953b KW	285	struct mdev_type *type = to_mdev_type(kobj);
	286
	287	parent = mdev_get_parent(type->parent);
	288	if (!parent)
	289	return -EINVAL;
	290
59bbf783	291	mutex_lock(&mdev_list_lock);
7b96953b KW	292
7b96953b KW	293	/* Check for duplicate */
59bbf783 AW	294	list_for_each_entry(tmp, &mdev_list, next) {
	295	if (!uuid_le_cmp(tmp->uuid, uuid)) {
	296	mutex_unlock(&mdev_list_lock);
	297	ret = -EEXIST;
	298	goto mdev_fail;
	299	}
7b96953b KW	300	}
	301
	302	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	303	if (!mdev) {
59bbf783	304	mutex_unlock(&mdev_list_lock);
7b96953b	305	ret = -ENOMEM;
59bbf783	306	goto mdev_fail;
7b96953b KW	307	}
	308
	309	memcpy(&mdev->uuid, &uuid, sizeof(uuid_le));
59bbf783 AW	310	list_add(&mdev->next, &mdev_list);
	311	mutex_unlock(&mdev_list_lock);
	312
7b96953b KW	313	mdev->parent = parent;
	314	kref_init(&mdev->ref);
	315
	316	mdev->dev.parent = dev;
	317	mdev->dev.bus = &mdev_bus_type;
	318	mdev->dev.release = mdev_device_release;
	319	dev_set_name(&mdev->dev, "%pUl", uuid.b);
	320
	321	ret = device_register(&mdev->dev);
	322	if (ret) {
	323	put_device(&mdev->dev);
59bbf783	324	goto mdev_fail;
7b96953b KW	325	}
	326
	327	ret = mdev_device_create_ops(kobj, mdev);
	328	if (ret)
59bbf783	329	goto create_fail;
7b96953b KW	330
	331	ret = mdev_create_sysfs_files(&mdev->dev, type);
	332	if (ret) {
	333	mdev_device_remove_ops(mdev, true);
59bbf783	334	goto create_fail;
7b96953b KW	335	}
	336
	337	mdev->type_kobj = kobj;
59bbf783	338	mdev->active = true;
7b96953b KW	339	dev_dbg(&mdev->dev, "MDEV: created\n");
7b96953b KW	340
59bbf783	341	return 0;
7b96953b	342
59bbf783	343	create_fail:
7b96953b	344	device_unregister(&mdev->dev);
59bbf783	345	mdev_fail:
7b96953b KW	346	mdev_put_parent(parent);
	347	return ret;
	348	}
	349
	350	int mdev_device_remove(struct device *dev, bool force_remove)
	351	{
49550787	352	struct mdev_device mdev, tmp;
42930553	353	struct mdev_parent *parent;
7b96953b KW	354	struct mdev_type *type;
	355	int ret;
	356
	357	mdev = to_mdev_device(dev);
49550787 AW	358
	359	mutex_lock(&mdev_list_lock);
	360	list_for_each_entry(tmp, &mdev_list, next) {
59bbf783	361	if (tmp == mdev)
49550787	362	break;
49550787 AW	363	}
49550787 AW	364
59bbf783 AW	365	if (tmp != mdev) {
	366	mutex_unlock(&mdev_list_lock);
	367	return -ENODEV;
	368	}
49550787	369
59bbf783 AW	370	if (!mdev->active) {
	371	mutex_unlock(&mdev_list_lock);
	372	return -EAGAIN;
	373	}
49550787	374
59bbf783 AW	375	mdev->active = false;
59bbf783 AW	376	mutex_unlock(&mdev_list_lock);
49550787	377
7b96953b KW	378	type = to_mdev_type(mdev->type_kobj);
7b96953b KW	379	parent = mdev->parent;
7b96953b KW	380
	381	ret = mdev_device_remove_ops(mdev, force_remove);
	382	if (ret) {
59bbf783	383	mdev->active = true;
7b96953b KW	384	return ret;
	385	}
	386
	387	mdev_remove_sysfs_files(dev, type);
	388	device_unregister(dev);
7b96953b	389	mdev_put_parent(parent);
49550787 AW	390
49550787 AW	391	return 0;
7b96953b KW	392	}
	393
	394	static int __init mdev_init(void)
	395	{
f790eb57	396	return mdev_bus_register();
7b96953b KW	397	}
	398
	399	static void __exit mdev_exit(void)
	400	{
	401	if (mdev_bus_compat_class)
	402	class_compat_unregister(mdev_bus_compat_class);
	403
	404	mdev_bus_unregister();
	405	}
	406
	407	module_init(mdev_init)
	408	module_exit(mdev_exit)
	409
	410	MODULE_VERSION(DRIVER_VERSION);
	411	MODULE_LICENSE("GPL v2");
	412	MODULE_AUTHOR(DRIVER_AUTHOR);
	413	MODULE_DESCRIPTION(DRIVER_DESC);
f790eb57	414	MODULE_SOFTDEP("post: vfio_mdev");