Prefetch to last level cache interconnect semantic

A System on a chip (SoC) or System on Package (SoP) comprising:

• an interconnect mesh having a plurality of mesh nodes;
• a plurality of processor cores located as respective mesh nodes;
• a plurality of last level cache (LLC) slices respectively co-located with a respective processor core;
• an input-output (IO) block coupled to a mesh nodes having an IO interface configured to be coupled to an IO device;
• and
• an integrated memory controller (IMC) block coupled to a mesh node and configured to control access to memory stored in one of more memory devices configured to be connected to the IMC block;
• wherein the SoC or SoP is configured to,
• store entries in a context association table including a primary address and one or more context addresses;
• monitor inbound transactions originating from the IO device;
• compare an inbound transaction address for an inbound transaction with the primary addresses in the context association table to identify a matching entry;
• and
• when there is a match, prefetch data stored in memory at the one or more context addresses for the matching entry and install the prefetched data in one of the LLC slices.

An apparatus, comprising an input-output (IO) block having integrated circuitry including,

• a mesh to peripheral component interconnect express (PCIe) unit to be coupled to a mesh interconnect having a plurality of mesh nodes to which a plurality of blocks are coupled, including processor core blocks, last level cache (LLC) blocks, and a memory controller block configured to be coupled to memory;
• a peripheral component interconnect express (PCIe) root port configured to interface with a PCIe IO device;
• an inbound transaction controller;
• a context association table, configured to store a plurality of entries comprising a primary address and one or more context addresses;
• circuitry and logic to monitor inbound transactions originating from the PCIe device and extract inbound transaction addresses;
• address match logic to match an address extracted from an inbound transaction with primary addresses of entries in the context association table;
• and
• circuitry and logic to detect when there is an address match from the address match logic and issue a prefetch data request configured to be forwarded via the mesh interconnect to retrieve data stored at the one or more context addresses in entry in the context association table having the matching primary address and install the data in one of the LLC blocks.