Downstream device service latency reporting for power management

• US 9,838,967 B2
• Filed: 01/12/2015
• Issued: 12/05/2017
• Est. Priority Date: 12/31/2008
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Jeyaseelan, Jaya L., Walsh, Jim, Gough, Robert E., Cooper, Barnes, Songer, Neil W.
• Primary Examiner(s): Stoynov, Stefan
• Application Number:
  US14/595,085
• Publication Number:
  US 20150257101A1
• Time in Patent Office: 1,058 Days
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3206 Monitoring of events, devices or parameters that trigger a change in power modality
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: G06F 13/4282 on a serial bus, e.g. I2C bus, SPI bus on daisy chain buses G06F13/4247
• CPC Class Codes: H04L 43/0858 One way delays
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An apparatus is provided that includes a transceiver to transmit and receive data between an upstream device and the apparatus, and further includes service latency reporting logic coupled to the transceiver to provide a service latency tolerance value of the apparatus to the upstream device, the service latency tolerance value corresponding to an activity state of the apparatus. The service latency tolerance value for an idle activity state can be greater than the service latency tolerance value for an active activity state.

Claims

1. An apparatus comprising:

a transceiver to transmit and receive data between an upstream device and the apparatus;

service latency reporting logic coupled to the transceiver to determine a latency tolerance value of the apparatus and generate latency tolerance reporting data to report the latency tolerance value to the upstream device, wherein the latency tolerance value comprises a time value of latency corresponding to an activity state of the apparatus and the latency tolerance reporting data identifies the time value;

wherein the latency tolerance value for an idle activity state is greater than the latency tolerance value for an active activity state.

2. The apparatus of claim 1, wherein the apparatus is a peripheral component interconnect express (PCIe) endpoint device.

3. The apparatus of claim 1, wherein the service latency reporting logic comprises a memory to store the latency tolerance value.

4. The apparatus of claim 3, wherein the memory is a register.

5. The apparatus of claim 1, wherein the service latency reporting logic is to provide the latency tolerance value in response to a change in the activity state of the apparatus.