Systems and methods for core droop mitigation based on license state

A method comprising:

• receiving, at a voltage regulator, a signal indicating a license mode corresponding to a selected set of execution units in a core or domain of a processor;
• based on the indicated license mode, selecting, via a threshold selector module, one of a plurality of thresholds stored in a plurality of threshold registers coupled to the threshold selector module, each of the thresholds corresponding to a unique license mode of the core or domain of a processor;
• detecting a voltage droop event in the core or domain of the processor via a voltage sense line coupled to an area of the core or domain expected to experience the voltage droop;
• determining, via a comparator, that the voltage droop event exceeds the selected threshold;
• and
• in response to the determination, triggering, via a voltage droop correction module, a voltage droop correction process.

At least one non-transitory computer-readable storage medium having stored thereon instructions that, when executed by a processor, cause the processor to perform operations comprising:

• receiving a signal indicating a license mode corresponding to a selected set of execution units in a core or domain;
• based on the indicated license mode, selecting one of a plurality of thresholds for the selected set of execution units from a plurality of threshold registers, each of the thresholds corresponding to a unique license mode of the core or domain of a processor;
• detecting a voltage droop event in the core or domain based on a signal from a voltage sense line coupled to an area of the core or domain expected to experience the voltage droop;
• determining that the voltage droop event detected based on the signal from the voltage sense line exceeds the selected threshold;
• and
• in response to the determination, triggering a voltage droop correction module to execute a voltage droop correction process.

A processor comprising:

• a plurality of cores each to independently execute instructions and to operate at independent voltages and frequencies;
• and
• one or more integrated voltage regulators to provide the independent voltages and frequencies to the plurality of cores, wherein each of the one or more voltage regulators comprises:
• a storage device to store a plurality of voltage droop thresholds, each voltage droop threshold corresponding to a unique license mode of the plurality of cores;
• an interface to receive, from a power control unit, a license grant message indicating a license mode for corresponding core of the plurality of cores, the license mode corresponding to a selected set of execution units;
• and
• a voltage droop correction module comprising:
• a threshold selector module to, based on the license mode indicated in the license grant message, select one of the plurality of voltage droop thresholds;
• a voltage sense line coupled to an area of the corresponding core expected to experience the voltage droop;
• and
• a comparator to compare a sensed voltage droop on the voltage sense line voltage droop in the corresponding core with the selected voltage droop threshold,
• wherein based on the comparison, the voltage droop correction module is configured to trigger a voltage droop correction process.