Broadcast scope selection in a data processing system utilizing a memory topology data structure

A processing unit for a coherent data processing system including a system fabric communicatively coupling a plurality of nodes arranged in a plurality of groups, wherein a plurality of coherence agents distributed among the nodes are assigned responsibility for certain addresses, the processing unit comprising:

• a processor core;
• interconnect logic configured to couple the processing unit to the system fabric of the data processing system;
• a topology data structure indicating, by group and node, differing physical locations within the data processing system of the plurality of coherence agents;
• a master configured to perform:
• accessing the topology data structure utilizing a request address to obtain a particular group and particular node of a particular coherence agent among the plurality of coherence agents uniquely assigned the request address;
• and
• based on the accessing, initially issuing, on the system fabric, a memory access request specifying the request address and utilizing a remote scope of broadcast that includes the particular node and excludes at least one other node in the particular group, wherein the particular node is a different one of the plurality of nodes than a home node containing the master.

A design structure tangibly embodied in a machine-readable storage device for designing, manufacturing, or testing an integrated circuit, the design structure comprising:

• a processing unit for a coherent data processing system including a system fabric communicatively coupling a plurality of nodes arranged in a plurality of groups, wherein a plurality of coherence agents distributed among the nodes are assigned responsibility for certain addresses, the processing unit including:
• a processor core;
• interconnect logic configured to couple the processing unit to the system fabric of the data processing system;
• a topology data structure indicating, by group and node, differing physical locations within the data processing system of the plurality of coherence agents;
• a master configured to perform:
• accessing the topology data structure utilizing a request address to obtain a particular group and particular node of a particular coherence agent among the plurality of coherence agents uniquely assigned the request address;
• and
• based on the accessing, initially issuing, on the system fabric, a memory access request specifying the request address and utilizing a remote scope of broadcast that includes the particular node and excludes at least one other node in the particular group, wherein the particular node is a different one of the plurality of nodes than a home node containing the master.