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vfio: Create wrappers for group register/unregister 

This avoids decoding group fields in the common functions used by
vfio_device registration, and prepares for further moving the vfio group
specific code into separate file.

Link: https://lore.kernel.org/r/20221201145535.589687-4-yi.l.liu@intel.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Yu He <yu.he@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu 2022-09-23 02:19:34 -07:00 committed by Jason Gunthorpe
parent dcb93d0364
commit 32e0922821
1 changed files with 16 additions and 7 deletions
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23
drivers/vfio/vfio_main.c
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@ -514,6 +514,20 @@ static struct vfio_group *vfio_group_find_or_alloc(struct device *dev)
return group;
}
static void vfio_device_group_register(struct vfio_device *device)
{
mutex_lock(&device->group->device_lock);
list_add(&device->group_next, &device->group->device_list);
mutex_unlock(&device->group->device_lock);
}
static void vfio_device_group_unregister(struct vfio_device *device)
{
mutex_lock(&device->group->device_lock);
list_del(&device->group_next);
mutex_unlock(&device->group->device_lock);
}
static int __vfio_register_dev(struct vfio_device *device,
struct vfio_group *group)
{
@ -552,9 +566,7 @@ static int __vfio_register_dev(struct vfio_device *device,
/* Refcounting can't start until the driver calls register */
refcount_set(&device->refcount, 1);
mutex_lock(&group->device_lock);
list_add(&device->group_next, &group->device_list);
mutex_unlock(&group->device_lock);
vfio_device_group_register(device);
return 0;
err_out:
@ -614,7 +626,6 @@ static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
* removed. Open file descriptors for the device... */
void vfio_unregister_group_dev(struct vfio_device *device)
{
struct vfio_group *group = device->group;
unsigned int i = 0;
bool interrupted = false;
long rc;
@ -642,9 +653,7 @@ void vfio_unregister_group_dev(struct vfio_device *device)
}
}
mutex_lock(&group->device_lock);
list_del(&device->group_next);
mutex_unlock(&group->device_lock);
vfio_device_group_unregister(device);
/* Balances device_add in register path */
device_del(&device->device);