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Perfcnt samples buffer is not exposed to UM, but we would like to keep a tag on it as a potential debug aid. PRIME imported GEM buffers are UM exposed, but since the usual Panfrost UM driver code path is not followed in their creation, they might remain unlabelled for their entire lifetime, so a generic tag was deemed preferable. The tag is assigned before a UM handle is created so it doesn't contradict the logic about labelling internal BOs. Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Steven Price <steven.price@arm.com> Link: https://lore.kernel.org/r/20250520174634.353267-3-adrian.larumbe@collabora.com