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| author |   Anthony DeRossi <ajderossi@gmail.com> | 2022-11-09 17:40:26 -0800 |
|---|---|---|
| committer |   Alex Williamson <alex.williamson@redhat.com> | 2022-11-10 12:03:36 -0700 |
| commit | 5cd189e410debedda416fecfc12f4716b5829845 (patch) | |
| tree | b5b0615bcd0526bd0a88ee73e7554de299bbd8b6 /drivers/vfio | |
| parent | vfio: Fix container device registration life cycle (diff) | |
| download | wireguard-linux-5cd189e410debedda416fecfc12f4716b5829845.tar.xz wireguard-linux-5cd189e410debedda416fecfc12f4716b5829845.zip | |
vfio: Export the device set open count
The open count of a device set is the sum of the open counts of all
devices in the set. Drivers can use this value to determine whether
shared resources are in use without tracking them manually or accessing
the private open_count in vfio_device.
Signed-off-by: Anthony DeRossi <ajderossi@gmail.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20221110014027.28780-3-ajderossi@gmail.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio_main.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 9a4af880e941..6e8804fe0095 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -125,6 +125,19 @@ static void vfio_release_device_set(struct vfio_device *device) xa_unlock(&vfio_device_set_xa); } +unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set) +{ + struct vfio_device *cur; + unsigned int open_count = 0; + + lockdep_assert_held(&dev_set->lock); + + list_for_each_entry(cur, &dev_set->device_list, dev_set_list) + open_count += cur->open_count; + return open_count; +} +EXPORT_SYMBOL_GPL(vfio_device_set_open_count); + /* * Group objects - create, release, get, put, search */ |