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vfio/mdev: embedd struct mdev_parent in the parent data structure

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Simplify mdev_{un}register_device by requiring the caller to pass in
a structure allocate as part of the parent device structure.  This
removes the need for a list of parents and the separate mdev_parent
refcount as we can simplify rely on the reference to the parent device.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
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/20220923092652.100656-5-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Christoph Hellwig
2022-09-23 11:26:42 +02:00
committed by Alex Williamson
parent bdef2b7896
commit 89345d5177
17 changed files with 71 additions and 146 deletions
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2
Documentation/s390/vfio-ap.rst
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@@ -297,7 +297,7 @@ of the VFIO AP mediated device driver::
| MDEV CORE |
| MODULE |
| mdev.ko |
| +---------+ | mdev_register_device() +--------------+
| +---------+ | mdev_register_parent() +--------------+
| |Physical | +<-----------------------+ |
| | device | | | vfio_ap.ko |<-> matrix
| |interface| +----------------------->+ | device

2
Documentation/s390/vfio-ccw.rst
View File

@@ -156,7 +156,7 @@ Below is a high Level block diagram::
| MDEV CORE |
| MODULE |
| mdev.ko |
| +---------+ | mdev_register_device() +--------------+
| +---------+ | mdev_register_parent() +--------------+
| |Physical | +<-----------------------+ |
| | device | | | vfio_ccw.ko |<-> subchannel
| |interface| +----------------------->+ | device