linux-kernel - [RFC PATCH 02/30] vfio: Export vfio device get and put registration helpers

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Message-Id: <20250529053513.1592088-3-yilun.xu@linux.intel.com>
Date: Thu, 29 May 2025 13:34:45 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
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Subject: [RFC PATCH 02/30] vfio: Export vfio device get and put registration helpers

From: Vivek Kasireddy <vivek.kasireddy@...el.com>

These helpers are useful for managing additional references taken
on the device from other associated VFIO modules.

Original-patch-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@...el.com>
---
 drivers/vfio/vfio_main.c | 2 ++
 include/linux/vfio.h     | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
index 1fd261efc582..620a3ee5d04d 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -171,11 +171,13 @@ void vfio_device_put_registration(struct vfio_device *device)
 	if (refcount_dec_and_test(&device->refcount))
 		complete(&device->comp);
 }
+EXPORT_SYMBOL_GPL(vfio_device_put_registration);
 
 bool vfio_device_try_get_registration(struct vfio_device *device)
 {
 	return refcount_inc_not_zero(&device->refcount);
 }
+EXPORT_SYMBOL_GPL(vfio_device_try_get_registration);
 
 /*
  * VFIO driver API
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 707b00772ce1..ba65bbdffd0b 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -293,6 +293,8 @@ static inline void vfio_put_device(struct vfio_device *device)
 int vfio_register_group_dev(struct vfio_device *device);
 int vfio_register_emulated_iommu_dev(struct vfio_device *device);
 void vfio_unregister_group_dev(struct vfio_device *device);
+bool vfio_device_try_get_registration(struct vfio_device *device);
+void vfio_device_put_registration(struct vfio_device *device);
 
 int vfio_assign_device_set(struct vfio_device *device, void *set_id);
 unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set);
-- 
2.25.1