[v2,2/5] vfio: export functions to get vfio_group from device and put it

Commit Message

Jike Song Oct. 29, 2016, 8:05 p.m. UTC

External users might want to get the vfio_group from a given
device, and put it after the usage.

Signed-off-by: Jike Song <[e-mail]>
---
 drivers/vfio/vfio.c  | 6 ++++--
 include/linux/vfio.h | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 23bc86c..e3e58e3 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -414,10 +414,11 @@  static void vfio_group_release(struct kref *kref)
 	iommu_group_put(iommu_group);
 }
 
-static void vfio_group_put(struct vfio_group *group)
+void vfio_group_put(struct vfio_group *group)
 {
 	kref_put_mutex(&group->kref, vfio_group_release, &vfio.group_lock);
 }
+EXPORT_SYMBOL_GPL(vfio_group_put);
 
 /* Assume group_lock or group reference is held */
 static void vfio_group_get(struct vfio_group *group)
@@ -480,7 +481,7 @@  static struct vfio_group *vfio_group_get_from_minor(int minor)
 	return group;
 }
 
-static struct vfio_group *vfio_group_get_from_dev(struct device *dev)
+struct vfio_group *vfio_group_get_from_dev(struct device *dev)
 {
 	struct iommu_group *iommu_group;
 	struct vfio_group *group;
@@ -494,6 +495,7 @@  static struct vfio_group *vfio_group_get_from_dev(struct device *dev)
 
 	return group;
 }
+EXPORT_SYMBOL_GPL(vfio_group_get_from_dev);
 
 /**
  * Device objects - create, release, get, put, search
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 0ecae0b..ad9b857 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -92,6 +92,9 @@  extern void vfio_unregister_iommu_driver(
 extern long vfio_external_check_extension(struct vfio_group *group,
 					  unsigned long arg);
 
+extern struct vfio_group *vfio_group_get_from_dev(struct device *dev);
+extern void vfio_group_put(struct vfio_group *group);
+
 /*
  * Sub-module helpers
  */