vfio-mdev: Switch to use new generic UUID API

There are new types and helpers that are supposed to be used in new code.

As a preparation to get rid of legacy types and API functions do
the conversion here.

Cc: Kirti Wankhede <kwankhede@nvidia.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/mdev/mdev_core.c

@@ -60,9 +60,9 @@ struct mdev_device *mdev_from_dev(struct device *dev)
 }
 EXPORT_SYMBOL(mdev_from_dev);
 
-uuid_le mdev_uuid(struct mdev_device *mdev)
+const guid_t *mdev_uuid(struct mdev_device *mdev)
 {
-	return mdev->uuid;
+	return &mdev->uuid;
 }
 EXPORT_SYMBOL(mdev_uuid);
 
@@ -88,8 +88,7 @@ static void mdev_release_parent(struct kref *kref)
 	put_device(dev);
 }
 
-static
-inline struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)
+static inline struct mdev_parent *mdev_get_parent(struct mdev_parent *parent)
 {
 	if (parent)
 		kref_get(&parent->ref);
@@ -276,7 +275,8 @@ static void mdev_device_release(struct device *dev)
 	kfree(mdev);
 }
 
-int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
+int mdev_device_create(struct kobject *kobj,
+		       struct device *dev, const guid_t *uuid)
 {
 	int ret;
 	struct mdev_device *mdev, *tmp;
@@ -291,7 +291,7 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
 
 	/* Check for duplicate */
 	list_for_each_entry(tmp, &mdev_list, next) {
-		if (!uuid_le_cmp(tmp->uuid, uuid)) {
+		if (guid_equal(&tmp->uuid, uuid)) {
 			mutex_unlock(&mdev_list_lock);
 			ret = -EEXIST;
 			goto mdev_fail;
@@ -305,7 +305,7 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
 		goto mdev_fail;
 	}
 
-	memcpy(&mdev->uuid, &uuid, sizeof(uuid_le));
+	guid_copy(&mdev->uuid, uuid);
 	list_add(&mdev->next, &mdev_list);
 	mutex_unlock(&mdev_list_lock);
 
@@ -315,7 +315,7 @@ int mdev_device_create(struct kobject *kobj, struct device *dev, uuid_le uuid)
 	mdev->dev.parent  = dev;
 	mdev->dev.bus     = &mdev_bus_type;
 	mdev->dev.release = mdev_device_release;
-	dev_set_name(&mdev->dev, "%pUl", uuid.b);
+	dev_set_name(&mdev->dev, "%pUl", uuid);
 
 	ret = device_register(&mdev->dev);
 	if (ret) {

drivers/vfio/mdev/mdev_private.h

@@ -28,7 +28,7 @@ struct mdev_parent {
 struct mdev_device {
 	struct device dev;
 	struct mdev_parent *parent;
-	uuid_le uuid;
+	guid_t uuid;
 	void *driver_data;
 	struct kref ref;
 	struct list_head next;
@@ -58,7 +58,8 @@ 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, uuid_le uuid);
+int  mdev_device_create(struct kobject *kobj,
+			struct device *dev, const guid_t *uuid);
 int  mdev_device_remove(struct device *dev, bool force_remove);
 
 #endif /* MDEV_PRIVATE_H */

drivers/vfio/mdev/mdev_sysfs.c

@@ -55,7 +55,7 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
 			    const char *buf, size_t count)
 {
 	char *str;
-	uuid_le uuid;
+	guid_t uuid;
 	int ret;
 
 	if ((count < UUID_STRING_LEN) || (count > UUID_STRING_LEN + 1))
@@ -65,12 +65,12 @@ static ssize_t create_store(struct kobject *kobj, struct device *dev,
 	if (!str)
 		return -ENOMEM;
 
-	ret = uuid_le_to_bin(str, &uuid);
+	ret = guid_parse(str, &uuid);
 	kfree(str);
 	if (ret)
 		return ret;
 
-	ret = mdev_device_create(kobj, dev, uuid);
+	ret = mdev_device_create(kobj, dev, &uuid);
 	if (ret)
 		return ret;
 

include/linux/mdev.h

@@ -120,7 +120,7 @@ struct mdev_driver {
 
 extern void *mdev_get_drvdata(struct mdev_device *mdev);
 extern void mdev_set_drvdata(struct mdev_device *mdev, void *data);
-extern uuid_le mdev_uuid(struct mdev_device *mdev);
+extern const guid_t *mdev_uuid(struct mdev_device *mdev);
 
 extern struct bus_type mdev_bus_type;
 

samples/vfio-mdev/mtty.c

@@ -156,15 +156,15 @@ static const struct file_operations vd_fops = {
 
 /* function prototypes */
 
-static int mtty_trigger_interrupt(uuid_le uuid);
+static int mtty_trigger_interrupt(const guid_t *uuid);
 
 /* Helper functions */
-static struct mdev_state *find_mdev_state_by_uuid(uuid_le uuid)
+static struct mdev_state *find_mdev_state_by_uuid(const guid_t *uuid)
 {
 	struct mdev_state *mds;
 
 	list_for_each_entry(mds, &mdev_devices_list, next) {
-		if (uuid_le_cmp(mdev_uuid(mds->mdev), uuid) == 0)
+		if (guid_equal(mdev_uuid(mds->mdev), uuid))
 			return mds;
 	}
 
@@ -1032,7 +1032,7 @@ static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags,
 	return ret;
 }
 
-static int mtty_trigger_interrupt(uuid_le uuid)
+static int mtty_trigger_interrupt(const guid_t *uuid)
 {
 	int ret = -1;
 	struct mdev_state *mdev_state;