[Intel-gfx] [PATCH v3 10/12] vfio: Mark cdev usage in vfio_device

[Liu, Yi L]

> From: Eric Auger <eric.auger at redhat.com>
> Sent: Wednesday, April 5, 2023 7:48 PM
> 
> On 4/1/23 16:44, Yi Liu wrote:
> > There are users that need to check if vfio_device is opened as cdev.
> > e.g. vfio-pci. This adds a flag in vfio_device, it will be set in the
> > cdev path when device is opened. This is not used at this moment, but
> > a preparation for vfio device cdev support.
> 
> better to squash this patch with the patch setting cdev_opened then?

But that would be in the cdev series. Maybe only add this helper to
return false and add the cdev_opened in below patch. Will this be
better?

https://lore.kernel.org/kvm/20230401151833.124749-23-yi.l.liu@intel.com/

> Thanks
> 
> Eric
> >
> > Signed-off-by: Yi Liu <yi.l.liu at intel.com>
> > ---
> >  include/linux/vfio.h | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/include/linux/vfio.h b/include/linux/vfio.h
> > index f8fb9ab25188..d9a0770e5fc1 100644
> > --- a/include/linux/vfio.h
> > +++ b/include/linux/vfio.h
> > @@ -62,6 +62,7 @@ struct vfio_device {
> >  	struct iommufd_device *iommufd_device;
> >  	bool iommufd_attached;
> >  #endif
> > +	bool cdev_opened;
> >  };
> >
> >  /**
> > @@ -151,6 +152,12 @@ vfio_iommufd_physical_devid(struct vfio_device *vdev,
> u32 *id)
> >  	((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
> >  #endif
> >
> > +static inline bool vfio_device_cdev_opened(struct vfio_device *device)
> > +{
> > +	lockdep_assert_held(&device->dev_set->lock);
> > +	return device->cdev_opened;
> > +}
> > +
> >  /**
> >   * @migration_set_state: Optional callback to change the migration state for
> >   *         devices that support migration. It's mandatory for