guc_send_reg
I915_WRITE(guc_send_reg(guc, i), action[i]);
POSTING_READ(guc_send_reg(guc, i - 1));
guc_send_reg(guc, 0),
response_buf[i] = I915_READ(guc_send_reg(guc, i + 1));
guc_send_reg(guc, i),