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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
commit5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch)
treea94efe259b9009378be6d90eb30d2b019d95c194 /drivers/vfio/mdev
parentInitial commit. (diff)
downloadlinux-upstream/5.10.209.tar.xz
linux-upstream/5.10.209.zip
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/vfio/mdev')
-rw-r--r--drivers/vfio/mdev/Kconfig18
-rw-r--r--drivers/vfio/mdev/Makefile6
-rw-r--r--drivers/vfio/mdev/mdev_core.c427
-rw-r--r--drivers/vfio/mdev/mdev_driver.c116
-rw-r--r--drivers/vfio/mdev/mdev_private.h67
-rw-r--r--drivers/vfio/mdev/mdev_sysfs.c281
-rw-r--r--drivers/vfio/mdev/vfio_mdev.c145
7 files changed, 1060 insertions, 0 deletions
diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
new file mode 100644
index 000000000..5da27f210
--- /dev/null
+++ b/drivers/vfio/mdev/Kconfig
@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config VFIO_MDEV
+ tristate "Mediated device driver framework"
+ depends on VFIO
+ default n
+ help
+ Provides a framework to virtualize devices.
+ See Documentation/driver-api/vfio-mediated-device.rst for more details.
+
+ If you don't know what do here, say N.
+
+config VFIO_MDEV_DEVICE
+ tristate "VFIO driver for Mediated devices"
+ depends on VFIO && VFIO_MDEV
+ default n
+ help
+ VFIO based driver for Mediated devices.
diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
new file mode 100644
index 000000000..101516fdf
--- /dev/null
+++ b/drivers/vfio/mdev/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o
+
+obj-$(CONFIG_VFIO_MDEV) += mdev.o
+obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
new file mode 100644
index 000000000..b558d4cfd
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -0,0 +1,427 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Mediated device Core Driver
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ * Author: Neo Jia <cjia@nvidia.com>
+ * Kirti Wankhede <kwankhede@nvidia.com>
+ */
+
+#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 struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)
+{
+ if (parent)
+ kref_get(&parent->ref);
+
+ return parent;
+}
+
+static void mdev_put_parent(struct mdev_parent *parent)
+{
+ if (parent)
+ kref_put(&parent->ref, mdev_release_parent);
+}
+
+/* Caller must hold parent unreg_sem read or write lock */
+static void mdev_device_remove_common(struct mdev_device *mdev)
+{
+ struct mdev_parent *parent;
+ struct mdev_type *type;
+ int ret;
+
+ type = to_mdev_type(mdev->type_kobj);
+ mdev_remove_sysfs_files(&mdev->dev, type);
+ device_del(&mdev->dev);
+ parent = mdev->parent;
+ lockdep_assert_held(&parent->unreg_sem);
+ ret = parent->ops->remove(mdev);
+ if (ret)
+ dev_err(&mdev->dev, "Remove failed: err=%d\n", ret);
+
+ /* Balances with device_initialize() */
+ put_device(&mdev->dev);
+ mdev_put_parent(parent);
+}
+
+static int mdev_device_remove_cb(struct device *dev, void *data)
+{
+ if (dev_is_mdev(dev)) {
+ struct mdev_device *mdev;
+
+ mdev = to_mdev_device(dev);
+ mdev_device_remove_common(mdev);
+ }
+ return 0;
+}
+
+/*
+ * 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;
+ char *env_string = "MDEV_STATE=registered";
+ char *envp[] = { env_string, NULL };
+
+ /* 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);
+ init_rwsem(&parent->unreg_sem);
+
+ 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");
+ kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
+
+ 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;
+ char *env_string = "MDEV_STATE=unregistered";
+ char *envp[] = { env_string, NULL };
+
+ 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);
+ mutex_unlock(&parent_list_lock);
+
+ down_write(&parent->unreg_sem);
+
+ class_compat_remove_link(mdev_bus_compat_class, dev, NULL);
+
+ device_for_each_child(dev, NULL, mdev_device_remove_cb);
+
+ parent_remove_sysfs_files(parent);
+ up_write(&parent->unreg_sem);
+
+ mdev_put_parent(parent);
+
+ /* We still have the caller's reference to use for the uevent */
+ kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(mdev_unregister_device);
+
+static void mdev_device_free(struct mdev_device *mdev)
+{
+ mutex_lock(&mdev_list_lock);
+ list_del(&mdev->next);
+ mutex_unlock(&mdev_list_lock);
+
+ dev_dbg(&mdev->dev, "MDEV: destroying\n");
+ kfree(mdev);
+}
+
+static void mdev_device_release(struct device *dev)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ mdev_device_free(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;
+
+ /* Check if parent unregistration has started */
+ if (!down_read_trylock(&parent->unreg_sem)) {
+ mdev_device_free(mdev);
+ ret = -ENODEV;
+ goto mdev_fail;
+ }
+
+ device_initialize(&mdev->dev);
+ mdev->dev.parent = dev;
+ mdev->dev.bus = &mdev_bus_type;
+ mdev->dev.release = mdev_device_release;
+ dev_set_name(&mdev->dev, "%pUl", uuid);
+ mdev->dev.groups = parent->ops->mdev_attr_groups;
+ mdev->type_kobj = kobj;
+
+ ret = parent->ops->create(kobj, mdev);
+ if (ret)
+ goto ops_create_fail;
+
+ ret = device_add(&mdev->dev);
+ if (ret)
+ goto add_fail;
+
+ ret = mdev_create_sysfs_files(&mdev->dev, type);
+ if (ret)
+ goto sysfs_fail;
+
+ mdev->active = true;
+ dev_dbg(&mdev->dev, "MDEV: created\n");
+ up_read(&parent->unreg_sem);
+
+ return 0;
+
+sysfs_fail:
+ device_del(&mdev->dev);
+add_fail:
+ parent->ops->remove(mdev);
+ops_create_fail:
+ up_read(&parent->unreg_sem);
+ put_device(&mdev->dev);
+mdev_fail:
+ mdev_put_parent(parent);
+ return ret;
+}
+
+int mdev_device_remove(struct device *dev)
+{
+ struct mdev_device *mdev, *tmp;
+ struct mdev_parent *parent;
+
+ 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);
+
+ parent = mdev->parent;
+ /* Check if parent unregistration has started */
+ if (!down_read_trylock(&parent->unreg_sem))
+ return -ENODEV;
+
+ mdev_device_remove_common(mdev);
+ up_read(&parent->unreg_sem);
+ return 0;
+}
+
+int mdev_set_iommu_device(struct device *dev, struct device *iommu_device)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ mdev->iommu_device = iommu_device;
+
+ return 0;
+}
+EXPORT_SYMBOL(mdev_set_iommu_device);
+
+struct device *mdev_get_iommu_device(struct device *dev)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ return mdev->iommu_device;
+}
+EXPORT_SYMBOL(mdev_get_iommu_device);
+
+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");
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
new file mode 100644
index 000000000..0d3223aee
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MDEV driver
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ * Author: Neo Jia <cjia@nvidia.com>
+ * Kirti Wankhede <kwankhede@nvidia.com>
+ */
+
+#include <linux/device.h>
+#include <linux/iommu.h>
+#include <linux/mdev.h>
+
+#include "mdev_private.h"
+
+static int mdev_attach_iommu(struct mdev_device *mdev)
+{
+ int ret;
+ struct iommu_group *group;
+
+ group = iommu_group_alloc();
+ if (IS_ERR(group))
+ return PTR_ERR(group);
+
+ ret = iommu_group_add_device(group, &mdev->dev);
+ if (!ret)
+ dev_info(&mdev->dev, "MDEV: group_id = %d\n",
+ iommu_group_id(group));
+
+ iommu_group_put(group);
+ return ret;
+}
+
+static void mdev_detach_iommu(struct mdev_device *mdev)
+{
+ iommu_group_remove_device(&mdev->dev);
+ dev_info(&mdev->dev, "MDEV: detaching iommu\n");
+}
+
+static int mdev_probe(struct device *dev)
+{
+ struct mdev_driver *drv = to_mdev_driver(dev->driver);
+ struct mdev_device *mdev = to_mdev_device(dev);
+ int ret;
+
+ ret = mdev_attach_iommu(mdev);
+ if (ret)
+ return ret;
+
+ if (drv && drv->probe) {
+ ret = drv->probe(dev);
+ if (ret)
+ mdev_detach_iommu(mdev);
+ }
+
+ return ret;
+}
+
+static int mdev_remove(struct device *dev)
+{
+ struct mdev_driver *drv = to_mdev_driver(dev->driver);
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ if (drv && drv->remove)
+ drv->remove(dev);
+
+ mdev_detach_iommu(mdev);
+
+ return 0;
+}
+
+struct bus_type mdev_bus_type = {
+ .name = "mdev",
+ .probe = mdev_probe,
+ .remove = mdev_remove,
+};
+EXPORT_SYMBOL_GPL(mdev_bus_type);
+
+/**
+ * mdev_register_driver - register a new MDEV driver
+ * @drv: the driver to register
+ * @owner: module owner of driver to be registered
+ *
+ * Returns a negative value on error, otherwise 0.
+ **/
+int mdev_register_driver(struct mdev_driver *drv, struct module *owner)
+{
+ /* initialize common driver fields */
+ drv->driver.name = drv->name;
+ drv->driver.bus = &mdev_bus_type;
+ drv->driver.owner = owner;
+
+ /* register with core */
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(mdev_register_driver);
+
+/*
+ * mdev_unregister_driver - unregister MDEV driver
+ * @drv: the driver to unregister
+ */
+void mdev_unregister_driver(struct mdev_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(mdev_unregister_driver);
+
+int mdev_bus_register(void)
+{
+ return bus_register(&mdev_bus_type);
+}
+
+void mdev_bus_unregister(void)
+{
+ bus_unregister(&mdev_bus_type);
+}
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
new file mode 100644
index 000000000..74c2e5411
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Mediated device interal definitions
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ * Author: Neo Jia <cjia@nvidia.com>
+ * Kirti Wankhede <kwankhede@nvidia.com>
+ */
+
+#ifndef MDEV_PRIVATE_H
+#define MDEV_PRIVATE_H
+
+int mdev_bus_register(void);
+void mdev_bus_unregister(void);
+
+struct mdev_parent {
+ struct device *dev;
+ const struct mdev_parent_ops *ops;
+ struct kref ref;
+ struct list_head next;
+ struct kset *mdev_types_kset;
+ struct list_head type_list;
+ /* Synchronize device creation/removal with parent unregistration */
+ struct rw_semaphore unreg_sem;
+};
+
+struct mdev_device {
+ struct device dev;
+ struct mdev_parent *parent;
+ guid_t uuid;
+ void *driver_data;
+ struct list_head next;
+ struct kobject *type_kobj;
+ struct device *iommu_device;
+ bool active;
+};
+
+static inline struct mdev_device *to_mdev_device(struct device *dev)
+{
+ return container_of(dev, struct mdev_device, dev);
+}
+#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
+
+struct mdev_type {
+ struct kobject kobj;
+ struct kobject *devices_kobj;
+ struct mdev_parent *parent;
+ struct list_head next;
+ struct attribute_group *group;
+};
+
+#define to_mdev_type_attr(_attr) \
+ container_of(_attr, struct mdev_type_attribute, attr)
+#define to_mdev_type(_kobj) \
+ container_of(_kobj, struct mdev_type, kobj)
+
+int parent_create_sysfs_files(struct mdev_parent *parent);
+void parent_remove_sysfs_files(struct mdev_parent *parent);
+
+int mdev_create_sysfs_files(struct device *dev, struct mdev_type *type);
+void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type);
+
+int mdev_device_create(struct kobject *kobj,
+ struct device *dev, const guid_t *uuid);
+int mdev_device_remove(struct device *dev);
+
+#endif /* MDEV_PRIVATE_H */
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
new file mode 100644
index 000000000..367ff5412
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -0,0 +1,281 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * File attributes for Mediated devices
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ * Author: Neo Jia <cjia@nvidia.com>
+ * Kirti Wankhede <kwankhede@nvidia.com>
+ */
+
+#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;
+ guid_t 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 = guid_parse(str, &uuid);
+ kfree(str);
+ if (ret)
+ return ret;
+
+ ret = mdev_device_create(kobj, dev, &uuid);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static 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,
+};
+
+static 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;
+ type->parent = parent;
+
+ ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
+ "%s-%s", dev_driver_string(parent->dev),
+ group->name);
+ if (ret) {
+ kobject_put(&type->kobj);
+ 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;
+ 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);
+ if (ret)
+ 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_link(type->devices_kobj, &dev->kobj, dev_name(dev));
+ if (ret)
+ return ret;
+
+ ret = sysfs_create_link(&dev->kobj, &type->kobj, "mdev_type");
+ if (ret)
+ goto type_link_failed;
+
+ ret = sysfs_create_files(&dev->kobj, mdev_device_attrs);
+ if (ret)
+ goto create_files_failed;
+
+ return ret;
+
+create_files_failed:
+ sysfs_remove_link(&dev->kobj, "mdev_type");
+type_link_failed:
+ sysfs_remove_link(type->devices_kobj, dev_name(dev));
+ return ret;
+}
+
+void mdev_remove_sysfs_files(struct device *dev, struct mdev_type *type)
+{
+ sysfs_remove_files(&dev->kobj, mdev_device_attrs);
+ sysfs_remove_link(&dev->kobj, "mdev_type");
+ sysfs_remove_link(type->devices_kobj, dev_name(dev));
+}
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
new file mode 100644
index 000000000..30964a4e0
--- /dev/null
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * VFIO based driver for Mediated device
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ * Author: Neo Jia <cjia@nvidia.com>
+ * Kirti Wankhede <kwankhede@nvidia.com>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/vfio.h>
+#include <linux/mdev.h>
+
+#include "mdev_private.h"
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "NVIDIA Corporation"
+#define DRIVER_DESC "VFIO based driver for Mediated device"
+
+static int vfio_mdev_open(void *device_data)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+ int ret;
+
+ if (unlikely(!parent->ops->open))
+ return -EINVAL;
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ ret = parent->ops->open(mdev);
+ if (ret)
+ module_put(THIS_MODULE);
+
+ return ret;
+}
+
+static void vfio_mdev_release(void *device_data)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+
+ if (likely(parent->ops->release))
+ parent->ops->release(mdev);
+
+ module_put(THIS_MODULE);
+}
+
+static long vfio_mdev_unlocked_ioctl(void *device_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->ioctl))
+ return -EINVAL;
+
+ return parent->ops->ioctl(mdev, cmd, arg);
+}
+
+static ssize_t vfio_mdev_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->read))
+ return -EINVAL;
+
+ return parent->ops->read(mdev, buf, count, ppos);
+}
+
+static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->write))
+ return -EINVAL;
+
+ return parent->ops->write(mdev, buf, count, ppos);
+}
+
+static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
+{
+ struct mdev_device *mdev = device_data;
+ struct mdev_parent *parent = mdev->parent;
+
+ if (unlikely(!parent->ops->mmap))
+ return -EINVAL;
+
+ return parent->ops->mmap(mdev, vma);
+}
+
+static const struct vfio_device_ops vfio_mdev_dev_ops = {
+ .name = "vfio-mdev",
+ .open = vfio_mdev_open,
+ .release = vfio_mdev_release,
+ .ioctl = vfio_mdev_unlocked_ioctl,
+ .read = vfio_mdev_read,
+ .write = vfio_mdev_write,
+ .mmap = vfio_mdev_mmap,
+};
+
+static int vfio_mdev_probe(struct device *dev)
+{
+ struct mdev_device *mdev = to_mdev_device(dev);
+
+ return vfio_add_group_dev(dev, &vfio_mdev_dev_ops, mdev);
+}
+
+static void vfio_mdev_remove(struct device *dev)
+{
+ vfio_del_group_dev(dev);
+}
+
+static struct mdev_driver vfio_mdev_driver = {
+ .name = "vfio_mdev",
+ .probe = vfio_mdev_probe,
+ .remove = vfio_mdev_remove,
+};
+
+static int __init vfio_mdev_init(void)
+{
+ return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
+}
+
+static void __exit vfio_mdev_exit(void)
+{
+ mdev_unregister_driver(&vfio_mdev_driver);
+}
+
+module_init(vfio_mdev_init)
+module_exit(vfio_mdev_exit)
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);