[PATCH 1/2] drm/panfrost: Allow passing extra information about BOs used by a job

[Alyssa Rosenzweig]

> > +	/**
> > +	 * Pointer to a u32 array of &drm_panfrost_submit_bo_desc objects. This
> > +	 * field is meant to replace &drm_panfrost_submit.bo_handles which did
> > +	 * not provide enough information to relax synchronization between
> > +	 * jobs that only only read the BO they share. When both
> > +	 * &drm_panfrost_submit.bo_handles and &drm_panfrost_submit.bo_descs
> > +	 * are provided, drm_panfrost_submit.bo_handles is ignored.
> > +	 */
> > +	__u64 bo_descs;
> > +
> > +	/**
> > +	 * Number of BO descriptors passed in (size is that times
> > +	 * sizeof(drm_panfrost_submit_bo_desc)).
> > +	 */
> > +	__u32 bo_desc_count;
> 
> We don't really need another count field. bo_handle_count could be
> re-used. Indeed this could even be handled with just a flags field with
> a new flag specifying that bo_handles no longer points to handles but to
> bo_desc objects instead.

This seems like the cleaniest approach (also bumping the ABI version).