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-rw-r--r--drivers/vfio/Kconfig1
-rw-r--r--drivers/vfio/Makefile1
-rw-r--r--drivers/vfio/mdev/Kconfig9
-rw-r--r--drivers/vfio/mdev/Makefile4
-rw-r--r--drivers/vfio/mdev/mdev_core.c374
-rw-r--r--drivers/vfio/mdev/mdev_driver.c119
-rw-r--r--drivers/vfio/mdev/mdev_private.h41
-rw-r--r--drivers/vfio/mdev/mdev_sysfs.c286
-rw-r--r--include/linux/mdev.h168
9 files changed, 1003 insertions, 0 deletions
diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index da6e2ce77495..23eced02aaf6 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -48,4 +48,5 @@ menuconfig VFIO_NOIOMMU
source "drivers/vfio/pci/Kconfig"
source "drivers/vfio/platform/Kconfig"
+source "drivers/vfio/mdev/Kconfig"
source "virt/lib/Kconfig"
diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
index 7b8a31f63fea..4a23c13b6be4 100644
--- a/drivers/vfio/Makefile
+++ b/drivers/vfio/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o
obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spapr_eeh.o
obj-$(CONFIG_VFIO_PCI) += pci/
obj-$(CONFIG_VFIO_PLATFORM) += platform/
+obj-$(CONFIG_VFIO_MDEV) += mdev/
diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
new file mode 100644
index 000000000000..258481d65ebd
--- /dev/null
+++ b/drivers/vfio/mdev/Kconfig
@@ -0,0 +1,9 @@
+
+config VFIO_MDEV
+ tristate "Mediated device driver framework"
+ depends on VFIO
+ default n
+ help
+ Provides a framework to virtualize devices.
+
+ If you don't know what do here, say N.
diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
new file mode 100644
index 000000000000..31bc04801d94
--- /dev/null
+++ b/drivers/vfio/mdev/Makefile
@@ -0,0 +1,4 @@
+
+mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o
+
+obj-$(CONFIG_VFIO_MDEV) += mdev.o
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
new file mode 100644
index 000000000000..613e8a8a3b2a
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -0,0 +1,374 @@
+/*
+ * 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 int _find_mdev_device(struct device *dev, void *data)
+{
+ struct mdev_device *mdev;
+
+ if (!dev_is_mdev(dev))
+ return 0;
+
+ mdev = to_mdev_device(dev);
+
+ if (uuid_le_cmp(mdev->uuid, *(uuid_le *)data) == 0)
+ return 1;
+
+ return 0;
+}
+
+static bool mdev_device_exist(struct parent_device *parent, uuid_le uuid)
+{
+ struct device *dev;
+
+ dev = device_find_child(parent->dev, &uuid, _find_mdev_device);
+ if (dev) {
+ put_device(dev);
+ return true;
+ }
+
+ return false;
+}
+
+/* Should be called holding parent_list_lock */
+static struct parent_device *__find_parent_device(struct device *dev)
+{
+ struct parent_device *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 parent_device *parent = container_of(kref, struct parent_device,
+ ref);
+ struct device *dev = parent->dev;
+
+ kfree(parent);
+ put_device(dev);
+}
+
+static
+inline struct parent_device *mdev_get_parent(struct parent_device *parent)
+{
+ if (parent)
+ kref_get(&parent->ref);
+
+ return parent;
+}
+
+static inline void mdev_put_parent(struct parent_device *parent)
+{
+ if (parent)
+ kref_put(&parent->ref, mdev_release_parent);
+}
+
+static int mdev_device_create_ops(struct kobject *kobj,
+ struct mdev_device *mdev)
+{
+ struct parent_device *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 parent_device *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 parent_ops *ops)
+{
+ int ret;
+ struct parent_device *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);
+ mutex_init(&parent->lock);
+
+ 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 parent_device *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);
+
+ 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;
+ struct parent_device *parent;
+ struct mdev_type *type = to_mdev_type(kobj);
+
+ parent = mdev_get_parent(type->parent);
+ if (!parent)
+ return -EINVAL;
+
+ mutex_lock(&parent->lock);
+
+ /* Check for duplicate */
+ if (mdev_device_exist(parent, uuid)) {
+ ret = -EEXIST;
+ goto create_err;
+ }
+
+ mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+ if (!mdev) {
+ ret = -ENOMEM;
+ goto create_err;
+ }
+
+ memcpy(&mdev->uuid, &uuid, sizeof(uuid_le));
+ 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 create_err;
+ }
+
+ ret = mdev_device_create_ops(kobj, mdev);
+ if (ret)
+ goto create_failed;
+
+ ret = mdev_create_sysfs_files(&mdev->dev, type);
+ if (ret) {
+ mdev_device_remove_ops(mdev, true);
+ goto create_failed;
+ }
+
+ mdev->type_kobj = kobj;
+ dev_dbg(&mdev->dev, "MDEV: created\n");
+
+ mutex_unlock(&parent->lock);
+ return ret;
+
+create_failed:
+ device_unregister(&mdev->dev);
+
+create_err:
+ mutex_unlock(&parent->lock);
+ mdev_put_parent(parent);
+ return ret;
+}
+
+int mdev_device_remove(struct device *dev, bool force_remove)
+{
+ struct mdev_device *mdev;
+ struct parent_device *parent;
+ struct mdev_type *type;
+ int ret;
+
+ mdev = to_mdev_device(dev);
+ type = to_mdev_type(mdev->type_kobj);
+ parent = mdev->parent;
+ mutex_lock(&parent->lock);
+
+ ret = mdev_device_remove_ops(mdev, force_remove);
+ if (ret) {
+ mutex_unlock(&parent->lock);
+ return ret;
+ }
+
+ mdev_remove_sysfs_files(dev, type);
+ device_unregister(dev);
+ mutex_unlock(&parent->lock);
+ mdev_put_parent(parent);
+ return ret;
+}
+
+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);
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
new file mode 100644
index 000000000000..6f0391f6f9b6
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -0,0 +1,119 @@
+/*
+ * MDEV 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/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 000000000000..d35097cbf3d7
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -0,0 +1,41 @@
+/*
+ * Mediated device interal definitions
+ *
+ * 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.
+ */
+
+#ifndef MDEV_PRIVATE_H
+#define MDEV_PRIVATE_H
+
+int mdev_bus_register(void);
+void mdev_bus_unregister(void);
+
+struct mdev_type {
+ struct kobject kobj;
+ struct kobject *devices_kobj;
+ struct parent_device *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 parent_device *parent);
+void parent_remove_sysfs_files(struct parent_device *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, uuid_le uuid);
+int mdev_device_remove(struct device *dev, bool force_remove);
+
+#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 000000000000..1a53deb2ee10
--- /dev/null
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -0,0 +1,286 @@
+/*
+ * 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 parent_device *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 parent_device *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 parent_device *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 parent_device *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);
+}
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
new file mode 100644
index 000000000000..ec819e9a115a
--- /dev/null
+++ b/include/linux/mdev.h
@@ -0,0 +1,168 @@
+/*
+ * Mediated device definition
+ *
+ * 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.
+ */
+
+#ifndef MDEV_H
+#define MDEV_H
+
+/* Parent device */
+struct parent_device {
+ struct device *dev;
+ const struct parent_ops *ops;
+
+ /* internal */
+ struct kref ref;
+ struct mutex lock;
+ struct list_head next;
+ struct kset *mdev_types_kset;
+ struct list_head type_list;
+};
+
+/* Mediated device */
+struct mdev_device {
+ struct device dev;
+ struct parent_device *parent;
+ uuid_le uuid;
+ void *driver_data;
+
+ /* internal */
+ struct kref ref;
+ struct list_head next;
+ struct kobject *type_kobj;
+};
+
+/**
+ * struct parent_ops - Structure to be registered for each parent device to
+ * register the device to mdev module.
+ *
+ * @owner: The module owner.
+ * @dev_attr_groups: Attributes of the parent device.
+ * @mdev_attr_groups: Attributes of the mediated device.
+ * @supported_type_groups: Attributes to define supported types. It is mandatory
+ * to provide supported types.
+ * @create: Called to allocate basic resources in parent device's
+ * driver for a particular mediated device. It is
+ * mandatory to provide create ops.
+ * @kobj: kobject of type for which 'create' is called.
+ * @mdev: mdev_device structure on of mediated device
+ * that is being created
+ * Returns integer: success (0) or error (< 0)
+ * @remove: Called to free resources in parent device's driver for a
+ * a mediated device. It is mandatory to provide 'remove'
+ * ops.
+ * @mdev: mdev_device device structure which is being
+ * destroyed
+ * Returns integer: success (0) or error (< 0)
+ * @open: Open mediated device.
+ * @mdev: mediated device.
+ * Returns integer: success (0) or error (< 0)
+ * @release: release mediated device
+ * @mdev: mediated device.
+ * @read: Read emulation callback
+ * @mdev: mediated device structure
+ * @buf: read buffer
+ * @count: number of bytes to read
+ * @ppos: address.
+ * Retuns number on bytes read on success or error.
+ * @write: Write emulation callback
+ * @mdev: mediated device structure
+ * @buf: write buffer
+ * @count: number of bytes to be written
+ * @ppos: address.
+ * Retuns number on bytes written on success or error.
+ * @ioctl: IOCTL callback
+ * @mdev: mediated device structure
+ * @cmd: ioctl command
+ * @arg: arguments to ioctl
+ * @mmap: mmap callback
+ * @mdev: mediated device structure
+ * @vma: vma structure
+ * Parent device that support mediated device should be registered with mdev
+ * module with parent_ops structure.
+ **/
+
+struct parent_ops {
+ struct module *owner;
+ const struct attribute_group **dev_attr_groups;
+ const struct attribute_group **mdev_attr_groups;
+ struct attribute_group **supported_type_groups;
+
+ int (*create)(struct kobject *kobj, struct mdev_device *mdev);
+ int (*remove)(struct mdev_device *mdev);
+ int (*open)(struct mdev_device *mdev);
+ void (*release)(struct mdev_device *mdev);
+ ssize_t (*read)(struct mdev_device *mdev, char __user *buf,
+ size_t count, loff_t *ppos);
+ ssize_t (*write)(struct mdev_device *mdev, const char __user *buf,
+ size_t count, loff_t *ppos);
+ ssize_t (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
+ unsigned long arg);
+ int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
+};
+
+/* interface for exporting mdev supported type attributes */
+struct mdev_type_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
+ ssize_t (*store)(struct kobject *kobj, struct device *dev,
+ const char *buf, size_t count);
+};
+
+#define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \
+struct mdev_type_attribute mdev_type_attr_##_name = \
+ __ATTR(_name, _mode, _show, _store)
+#define MDEV_TYPE_ATTR_RW(_name) \
+ struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name)
+#define MDEV_TYPE_ATTR_RO(_name) \
+ struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name)
+#define MDEV_TYPE_ATTR_WO(_name) \
+ struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name)
+
+/**
+ * struct mdev_driver - Mediated device driver
+ * @name: driver name
+ * @probe: called when new device created
+ * @remove: called when device removed
+ * @driver: device driver structure
+ *
+ **/
+struct mdev_driver {
+ const char *name;
+ int (*probe)(struct device *dev);
+ void (*remove)(struct device *dev);
+ struct device_driver driver;
+};
+
+#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
+#define to_mdev_device(dev) container_of(dev, struct mdev_device, dev)
+
+static inline void *mdev_get_drvdata(struct mdev_device *mdev)
+{
+ return mdev->driver_data;
+}
+
+static inline void mdev_set_drvdata(struct mdev_device *mdev, void *data)
+{
+ mdev->driver_data = data;
+}
+
+extern struct bus_type mdev_bus_type;
+
+#define dev_is_mdev(d) ((d)->bus == &mdev_bus_type)
+
+extern int mdev_register_device(struct device *dev,
+ const struct parent_ops *ops);
+extern void mdev_unregister_device(struct device *dev);
+
+extern int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
+extern void mdev_unregister_driver(struct mdev_driver *drv);
+
+#endif /* MDEV_H */
generated by cgit (git 2.34.1) at 2024-06-26 18:41:34 +0000