Re: [PATCH V4 05/18] iommu/ioasid: Redefine IOASID set and allocation APIs

[Jason Gunthorpe]

On Wed, May 05, 2021 at 04:23:19PM -0700, Raj, Ashok wrote:
> > Which implies the API to the iommu driver should be more like:
> > 
> >   'assign an IOASID to this RID and return the PASID'
> >   'reserve a PASID from every RID'
> 
> I don't think this has any decent change of success. Its rather round about
> way to get a global PASID namespace.
> 
> >   'assign an IOASID to this RID and use this specific PASID'
> 
> This seems a bit complicated. Another way to specify this.

Maybe, but I don't like that the driver-based iommu API has been
corrupted by injecting a global 'first driver to claim it'
resource. It is not properly layered anymore.

Jason