Method, apparatus, and system for enabling platform power states

摘要

To address the need for power management, the following facilitates maintaining power states in an efficient manner based at least in part on managing packets at different layers of an input/output interface that supports multiple layers. One specific example prevents a destructive event for link layer control logic because packets and information might have been lost or dropped due to a hang condition and/or a dropped packet. In yet another example of power management, this facilitates a low power platform state by preventing the loss of packets or data upon exiting a platform power state upon initiation of a link reset condition by preventing certain types of packets from reaching link layer controller logic.

主权项

1. A method for managing an interface of a first agent, the method comprising:
determining that a second agent supports a mode of the first agent selective allowance of transmission of a packet of a first packet type and prevention of transmission of a packet of a second packet type from the first agent to the second agent, wherein determining includes handshaking between the first and second agent to determine, by the first agent, that the second agent supports the mode of the first agent selective allowance of transmission of a packet of the first packet type and prevention of transmission of a packet of the second packet type from the first agent to the second agent; prior to entry into a low power state, the first agent enabling the selective allowance to transmit the first packet type and prevention of transmission of the second packet type by the first agent to the second agent; and upon exit from the low power state, the first agent enabling allowance of transmission from the first agent of packets of both the first and second packet types, wherein exiting includes performing a link layer reset.