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The hmm_range_fault() and the migration helpers currently need a common "owner" to identify pagemaps and clients with fast interconnect. Add a drm_pagemap utility to setup such owners by registering drm_pagemaps, in a registry, and for each new drm_pagemap, query which existing drm_pagemaps have fast interconnects with the new drm_pagemap. The "owner" scheme is limited in that it is static at drm_pagemap creation. Ideally one would want the owner to be adjusted at run-time, but that requires changes to hmm. If the proposed scheme becomes too limited, we need to revisit. v2: - Improve documentation of DRM_PAGEMAP_OWNER_LIST_DEFINE(). (Matt Brost) Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> # For merging through drm-xe. Link: https://patch.msgid.link/20251219113320.183860-11-thomas.hellstrom@linux.intel.com