CTX_RING_TAIL
regs[CTX_RING_TAIL]);
GEM_BUG_ON(ce->lrc_reg_state[CTX_RING_TAIL] != rq->ring->tail);
ce->lrc_reg_state[CTX_RING_TAIL] = tail;
regs[CTX_RING_TAIL] = ring->tail;
CTX_RING_TAIL - 1,
ce->lrc_reg_state[CTX_RING_TAIL]);
rq->context->lrc_reg_state[CTX_RING_TAIL] =