linux/drivers/vfio
Jason Gunthorpe 2b678aa2f0 vfio: Use a refcount_t instead of a kref in the vfio_group
The next patch adds a struct device to the struct vfio_group, and it is
confusing/bad practice to have two krefs in the same struct. This kref is
controlling the period when the vfio_group is registered in sysfs, and
visible in the internal lookup. Switch it to a refcount_t instead.

The refcount_dec_and_mutex_lock() is still required because we need
atomicity of the list searches and sysfs presence.

Reviewed-by: Liu Yi L <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/4-v3-2fdfe4ca2cc6+18c-vfio_group_cdev_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2021-10-15 13:58:20 -06:00
..
fsl-mc Merge branch 'v5.16/vfio/diana-fsl-reset-v2' into v5.16/vfio/next 2021-10-11 15:50:49 -06:00
mdev vfio: simplify iommu group allocation for mediated devices 2021-09-30 12:46:44 -06:00
pci Merge branch 'v5.16/vfio/colin_xu_igd_opregion_2.0_v8' into v5.16/vfio/next 2021-10-12 10:26:41 -06:00
platform vfio: Move vfio_iommu_group_get() to vfio_register_group_dev() 2021-09-30 12:46:43 -06:00
Kconfig vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on' 2021-08-26 10:36:51 -06:00
Makefile vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices 2020-10-07 14:17:33 -06:00
vfio_iommu_spapr_tce.c vfio/spapr_tce: reject mediated devices 2021-09-30 12:46:44 -06:00
vfio_iommu_type1.c vfio/iommu_type1: remove IS_IOMMU_CAP_DOMAIN_IN_CONTAINER 2021-09-30 12:46:45 -06:00
vfio_spapr_eeh.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
vfio.c vfio: Use a refcount_t instead of a kref in the vfio_group 2021-10-15 13:58:20 -06:00
vfio.h vfio: clean up the check for mediated device in vfio_iommu_type1 2021-09-30 12:46:44 -06:00
virqfd.c vfio/virqfd: Drain events from eventfd in virqfd_wakeup() 2020-11-15 09:49:10 -05:00