CTX_BB_HEAD_U     852 drivers/gpu/drm/i915/gt/intel_lrc.c 	regs[CTX_BB_HEAD_U] = i915_mmio_reg_offset(RING_BBADDR_UDW(base));
CTX_BB_HEAD_U    3223 drivers/gpu/drm/i915/gt/intel_lrc.c 	CTX_REG(regs, CTX_BB_HEAD_U, RING_BBADDR_UDW(base), 0);