linux/samples/vfio-mdev
Jason Gunthorpe 9c799c224d vfio/mdev: add mdev available instance checking to the core
Many of the mdev drivers use a simple counter for keeping track of the
available instances. Move this code to the core code and store the counter
in the mdev_parent. Implement it using correct locking, fixing mdpy.

Drivers just provide the value in the mdev_driver at registration time
and the core code takes care of maintaining it and exposing the value in
sysfs.

[hch: count instances per-parent instead of per-type, use an atomic_t
 to avoid taking mdev_list_lock in the show method]

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Link: https://lore.kernel.org/r/20220923092652.100656-15-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2022-10-04 12:06:58 -06:00
..
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
mbochs.c vfio/mdev: consolidate all the description sysfs into the core code 2022-10-04 12:06:58 -06:00
mdpy-defs.h PCI: Move PCI_VENDOR_ID_REDHAT definition to pci_ids.h 2020-07-09 17:00:47 -05:00
mdpy-fb.c samples: vfio-mdev: fix error handing in mdpy_fb_probe() 2021-05-24 13:40:13 -06:00
mdpy.c vfio/mdev: add mdev available instance checking to the core 2022-10-04 12:06:58 -06:00
mtty.c vfio/mdev: consolidate all the available_instance sysfs into the core code 2022-10-04 12:06:58 -06:00