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authorJason Gunthorpe <jgg@nvidia.com>2021-10-15 08:40:54 -0300
committerAlex Williamson <alex.williamson@redhat.com>2021-10-15 13:58:20 -0600
commit9cef73918e15d2284e71022291a8a07901e80bad (patch)
treef61dcce6458a1bc36e605ab5ea8ba998153fdaaa /drivers/s390
parent2b678aa2f0990a25e15cdef66256a131566ecd2e (diff)
vfio: Use cdev_device_add() instead of device_create()
Modernize how vfio is creating the group char dev and sysfs presence. These days drivers with state should use cdev_device_add() and cdev_device_del() to manage the cdev and sysfs lifetime. This API requires the driver to put the struct device and struct cdev inside its state struct (vfio_group), and then use the usual device_initialize()/cdev_device_add()/cdev_device_del() sequence. Split the code to make this possible: - vfio_group_alloc()/vfio_group_release() are pair'd functions to alloc/free the vfio_group. release is done under the struct device kref. - vfio_create_group()/vfio_group_put() are pairs that manage the sysfs/cdev lifetime. Once the uses count is zero the vfio group's userspace presence is destroyed. - The IDR is replaced with an IDA. container_of(inode->i_cdev) is used to get back to the vfio_group during fops open. The IDA assigns unique minor numbers. Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/5-v3-2fdfe4ca2cc6+18c-vfio_group_cdev_jgg@nvidia.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/s390')
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