mmSDMA0_RLC1_RB_CNTL
retval = base[engine_id] + queue_id * (mmSDMA0_RLC1_RB_CNTL -
#define KFD_CIK_SDMA_QUEUE_OFFSET (mmSDMA0_RLC1_RB_CNTL - mmSDMA0_RLC0_RB_CNTL)