Re: [PATCH v4 4/17] iommufd: Document overview of iommufd

Jason Gunthorpe
2022-11-14T15:14:14Z

On Fri, Nov 11, 2022 at 05:59:02AM +0000, Tian, Kevin wrote:
> > From: Jason Gunthorpe <jgg@nvidia.com>
> > Sent: Wednesday, November 9, 2022 1:10 AM
> >
> > +/**
> > + * iommufd_device_unbind - Undo iommufd_device_bind()
> > + * @idev: Device returned by iommufd_device_bind()
> > + *
> > + * Release the device from iommufd control. The DMA ownership will
> > return back
> > + * to unowned with blocked DMA. This invalidates the iommufd_device
>
> unowned but not blocked DMA. iommu_device_release_dma_owner()
> will decide what will be the state then, e.g. attached back to the default
> domain in most cases.

Woops

* Release the device from iommufd control. The DMA ownership will return back
* to unowned with DMA controlled by the DMA API. This invalidates the
* iommufd_device pointer, other APIs that consume it must not be called
* concurrently.

Thanks,
Jason