linux-kernel - [PATCH v7 07/11] vfio: Export vfio device get and put registration helpers

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Message-ID: <20251106-dmabuf-vfio-v7-7-2503bf390699@nvidia.com>
Date: Thu,  6 Nov 2025 16:16:52 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Jens Axboe <axboe@...nel.dk>,
	Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Ankit Agrawal <ankita@...dia.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <skolothumtho@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex@...zbot.org>
Cc: Krishnakant Jaju <kjaju@...dia.com>,
	Matt Ochs <mochs@...dia.com>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-doc@...r.kernel.org,
	linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	kvm@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Alex Mastro <amastro@...com>,
	Nicolin Chen <nicolinc@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>
Subject: [PATCH v7 07/11] 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>
Tested-by: Alex Mastro <amastro@...com>
Tested-by: Nicolin Chen <nicolinc@...dia.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 38c8e9350a60..9aa4a5d081e8 100644
--- a/drivers/vfio/vfio_main.c
+++ b/drivers/vfio/vfio_main.c
@@ -172,11 +172,13 @@ 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 eb563f538dee..217ba4ef1752 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -297,6 +297,8 @@ 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);

-- 
2.51.1