This returns the index in the supported_type_groups array that is
associated with the mdev_type attached to the struct mdev_device or its
containing struct kobject.
Each mdev_device can be spawned from exactly one mdev_type, which in turn
originates from exactly one supported_type_group.
Drivers are using weird string calculations to try and get back to this
index, providing a direct access to the index removes a bunch of wonky
driver code.
mdev_type->group can be deleted as the group is obtained using the
type_group_id.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
drivers/vfio/mdev/mdev_core.c | 20 ++++++++++++++++++++
drivers/vfio/mdev/mdev_private.h | 2 +-
drivers/vfio/mdev/mdev_sysfs.c | 15 +++++++++------
include/linux/mdev.h | 3 +++
4 files changed, 33 insertions(+), 7 deletions(-)
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index 2a20bdaf614214..5ae06f951a0998 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -33,6 +33,26 @@ struct device *mdev_parent_dev(struct mdev_device *mdev)
}
EXPORT_SYMBOL(mdev_parent_dev);
+/*
+ * Return the index in supported_type_groups that this mdev_device was created
+ * from.
+ */
+unsigned int mdev_get_type_group_id(struct mdev_device *mdev)
+{
+ return mdev->type->type_group_id;
+}
+EXPORT_SYMBOL(mdev_get_type_group_id);
+
+/*
+ * Used in mdev_type_attribute sysfs functions to return the index in the
+ * supported_type_groups that the sysfs is called from.
+ */
+unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj)
+{
+ return container_of(mtype_kobj, struct mdev_type, kobj)->type_group_id;
+}
+EXPORT_SYMBOL(mtype_get_type_group_id);
+
/* Should be called holding parent_list_lock */
static struct mdev_parent *__find_parent_device(struct device *dev)
{
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 10eccc35782c4d..a656cfe0346c33 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -29,7 +29,7 @@ struct mdev_type {
struct kobject *devices_kobj;
struct mdev_parent *parent;
struct list_head next;
- struct attribute_group *group;
+ unsigned int type_group_id;
};
#define to_mdev_type_attr(_attr) \
diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 8c169d12ba7dbb..712fbc78b12e2d 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -92,9 +92,11 @@ static struct kobj_type mdev_type_ktype = {
};
static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
- struct attribute_group *group)
+ unsigned int type_group_id)
{
struct mdev_type *type;
+ struct attribute_group *group =
+ parent->ops->supported_type_groups[type_group_id];
int ret;
if (!group->name) {
@@ -110,6 +112,7 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
type->parent = parent;
/* Pairs with the put in mdev_type_release() */
mdev_get_parent(parent);
+ type->type_group_id = type_group_id;
ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
"%s-%s", dev_driver_string(parent->dev),
@@ -135,8 +138,6 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
ret = -ENOMEM;
goto attrs_failed;
}
-
- type->group = group;
return type;
attrs_failed:
@@ -151,8 +152,11 @@ static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
static void remove_mdev_supported_type(struct mdev_type *type)
{
+ struct attribute_group *group =
+ type->parent->ops->supported_type_groups[type->type_group_id];
+
sysfs_remove_files(&type->kobj,
- (const struct attribute **)type->group->attrs);
+ (const struct attribute **)group->attrs);
kobject_put(type->devices_kobj);
sysfs_remove_file(&type->kobj, &mdev_type_attr_create.attr);
kobject_del(&type->kobj);
@@ -166,8 +170,7 @@ static int add_mdev_supported_type_groups(struct mdev_parent *parent)
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]);
+ type = add_mdev_supported_type(parent, i);
if (IS_ERR(type)) {
struct mdev_type *ltype, *tmp;
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index fb582adda28a9b..41e91936522394 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -46,6 +46,9 @@ static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev)
return mdev->iommu_device;
}
+unsigned int mdev_get_type_group_id(struct mdev_device *mdev);
+unsigned int mtype_get_type_group_id(struct kobject *mtype_kobj);
+
/**
* struct mdev_parent_ops - Structure to be registered for each parent device to
* register the device to mdev module.
--
2.31.1
