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If we want to be able to skip CPU cache maintenance operations on CPU-cached mappings, the UMD needs to know the kind of coherency in place. Add a field to drm_panthor_gpu_info to do that. We can re-use a padding field for that since this object is write-only from the KMD perspective, and the UMD should just ignore it. v2: - New commit v3: - Make coherency protocol a real enum, not a bitmask - Add BUILD_BUG_ON()s to make sure the values in panthor_regs.h and those exposed through the uAPI match v4: - Add Steve's R-b v5: - No changes v6: - No changes v7: - Fix kernel doc v8: - No changes Reviewed-by: Steven Price <steven.price@arm.com> Reviewed-by: Karunika Choo <karunika.choo@arm.com> Link: https://patch.msgid.link/20251208100841.730527-4-boris.brezillon@collabora.com Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>