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vfio: Export vfio device get and put registration helpers

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

Original-patch-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Alex Mastro <amastro@fb.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Ankit Agrawal <ankita@nvidia.com>
Link: https://lore.kernel.org/r/20251120-dmabuf-vfio-v9-7-d7f71607f371@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
This commit is contained in:
Vivek Kasireddy 2025-11-20 11:28:26 +02:00 committed by Alex Williamson
parent 3aa31a8bb1
commit 64a5dedcff
2 changed files with 4 additions and 0 deletions
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2
drivers/vfio/vfio_main.c
View File

@ -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

2
include/linux/vfio.h
View File

@ -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);