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With multi-device we are much more likely to have multiple drm-gpusvm ranges pointing to the same struct mm range. To avoid calling into drm_pagemap_populate_mm(), which is always very costly, introduce a much less costly drm_gpusvm function, drm_gpusvm_scan_mm() to scan the current migration state. The device fault-handler and prefetcher can use this function to determine whether migration is really necessary. There are a couple of performance improvements that can be done for this function if it turns out to be too costly. Those are documented in the code. v3: - New patch. Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> # For merging through drm-xe. Link: https://patch.msgid.link/20251219113320.183860-21-thomas.hellstrom@linux.intel.com