System, apparatus and method for synchronizing multiple virtual link states over a package interconnect

A method comprising:

• multiplexing, in an arbiter/multiplexer (ARB/MUX) of a first device, first information of a first protocol stack circuit and second information of a second protocol stack circuit, the ARB/MUX comprising:
• a first virtual link state machine (vLSM) for a first link layer, the first vLSM associated with and to virtualize a link state of the first link layer;
• and
• a second vLSM for a second link layer, the second vLSM associated with and to virtualize a link state of the second link layer, the first device comprising the first protocol stack circuit comprising a first transaction layer and the first link layer and the second protocol stack circuit comprising a second transaction layer and the second link layer;
• sending, from the first vLSM, a first status synchronization message, the first status synchronization message to identify a link state of the first vLSM;
• receiving a second status synchronization message, the second status synchronization message to identify a link state of a third vLSM;
• and
• based at least in part on the link state of the first vLSM and the link state of the third vLSM, determining a resolved vLSM state.

A system comprising:

• a first processor having a first plurality of processor cores;
• a second processor having a second plurality of processor cores;
• and
• a point-to-point interconnect to couple the first processor with the second processor, wherein the first processor further comprises:
• a first protocol stack circuit comprising a first transaction layer and a first link layer;
• a second protocol stack circuit comprising a second transaction layer and a second link layer;
• an arbiter/multiplexer (ARB/MUX) coupled to the first protocol stack circuit and the second protocol stack circuit, the ARB/MUX to multiplex first information of the first protocol stack circuit and second information of the second protocol stack circuit, wherein the ARB/MUX comprises:
• a first virtual link state machine (vLSM) for the first link layer, the first vLSM associated with and to virtualize a link state of the first link layer;
• and
• a second vLSM for the second link layer, the second vLSM associated with and to virtualize a link state of the second link layer;
• wherein the first vLSM is to:
• send a first status synchronization message to a third vLSM, the first status synchronization message to identify a link state of the first vLSM;
• and
• receive a second status synchronization message, the second status synchronization message to identify a link state of the third vLSM, wherein based at least in part on the link state of the first vLSM and the link state of the third vLSM, the ARB/MUX is to determine a resolved vLSM state.