linux-kernel - [PATCH 07/10] vfio: Export vfio device get and put registration helpers

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Message-ID: <045df5fc463bbac4c669413fabd4d22e54b58c87.1753274085.git.leonro@nvidia.com>
Date: Wed, 23 Jul 2025 16:00:08 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Christoph Hellwig <hch@....de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org,
	iommu@...ts.linux.dev,
	Jens Axboe <axboe@...nel.dk>,
	Jérôme Glisse <jglisse@...hat.com>,
	Joerg Roedel <joro@...tes.org>,
	kvm@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linux-mm@...ck.org,
	linux-pci@...r.kernel.org,
	Logan Gunthorpe <logang@...tatee.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Will Deacon <will@...nel.org>
Subject: [PATCH 07/10] 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.

Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@...el.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.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 1fd261efc582d..620a3ee5d04db 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 707b00772ce1f..ba65bbdffd0b2 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);
-- 
2.50.1