CHI trans--Home节点发起的操作
总目录：
CHI协议简读汇总-CSDN博客
https://blog.csdn.net/zhangshangjie1/article/details/131877216
Home节点能够发起的操作，包含如下几类：
- Home to Subordinate Read transactions
- Home to Subordinate Write transactions
- Home to Subordinate Combined Write and CMO transactions
- Home to Subordinate Atomic transactions
- Home to Subordinate Dataless transactions
- Home to Snoopee transactions
- Home to Snoopee DVM transactions
Home to Subordinate Read transactions
Home to Subordinate Write transactions
- opt, 如果请求需要TagMatch response, SN会返回一个TagMatch to home;
- SN可以选择等待数据接收后，再发送TagMatch, 也可以不等；
Home to Subordinate Write Zero transactions
Home to Subordinate Combined Write and CMO transactions
注：opt, 对于SN, 可以在发送CompCMO/Persist/CompPersist之前，等待write data，也可以不等；
Home to Subordinate Dataless transactions
注：使用separate resp, 可以允许completer发送early comp，而不用等待Persist, 因为Persist会等待更长的时间；
（HN发送这类指令，SN的行为是什么？）
Home to Subordinate Atomic transactions
- When the Subordinate supports the execution of atomic operations, the Home is permitted to forward Atomic transactions to the Subordinate.
Home to Snoopee transactions
（什么场景下，会发送这类指令？）
Home to Snoopee DVM transactions
（什么场景下，会发送这类指令？）