Advanced Micro Devices Corporation

Globalfoundries Inc.

Andrew William Lueck

Mark Douglas Hummel

Geoffrey S Strongin

Mitchell K Alsup

Michael Haertel

Alexander J Branover

Andrew Gregory Kegel

Guhan Krishnan

Paul Edward Kitchin

Krishna Sai Bernucho

Benjamin Tsien

Maurice B Steinman

William Alexander Hughes

David A Kaplan

Ronald Perez

Paul Blinzer

Chintan S Patel

Sonu Arora

Walter G Fry

Madhu Saravana Sibi Govindan

Geoffrey S S Strongin

Francisco Leonel Duran

Ming L So

Ali Ibrahim

Gary H Simpson

Wallace Paul Montgomery

Mom-Eng Ng

Dan P Shimizu

Laura M Smith

Hemant R Mohapatra

Xiaogang Zheng

Sreenath Thangarajan

A data processor includes a data fabric, a memory controller, a last level cache, and a traffic monitor. The data fabric is for routing requests between a plurality of requestors and a plurality of responders. The memory controller is for accessing a volatile memory. The last level cache is coupled between the memory controller and the data fabric. The traffic monitor is coupled to the last level cache and operable to monitor traffic between the last level cache and the memory controller, and based on detecting an idle condition in the monitored traffic, to cause the memory controller to command the volatile memory to enter self-refresh mode while the last level cache maintains an operational power state and responds to cache hits over the data fabric.

Last level cache access during non-Cstate self refresh

A processor includes a processor core and a power management controller operable to receive a timer event, store the timer event, generate a hardware system sleep command to enter a hardware system sleep state, and restore the timer event upon exiting from the hardware system sleep state.

Method and apparatus for transitioning a system to an active disconnect state

A system includes a processor including at least a first core and a local interrupt controller associated with the first core. The first core is operable to store its architectural state prior to entering a first core sleep state, and the processor is operable to receive and implement a request for entering a system sleep state in which the first core is in the first core sleep state and the local interrupt controller is powered down and exit the system sleep state by restoring the local interrupt controller and restoring the saved architectural state of the first core.

Methods and apparatus related to processor sleep states

Boot configuration information is stored to a volatile memory of a processing system during a low-power state. When resuming from the low-power state, a processor device accesses configuration information for a memory controller from a non-volatile memory and restores the memory controller using the configuration information so as to permit access to the volatile memory. The processor device then configures the initial contexts one or more processor cores using the core state information maintained by the volatile memory during the low-power state and accessed via the configured memory controller, and the one or more processor cores completes the boot process by executing resume boot code maintained by the volatile memory during the low-power state and accessed via the configured memory controller, rather than accessing boot code from a non-volatile memory.

Reintialization of a processing system from volatile memory upon resuming from a low-power state

A system and method for efficient management of operating modes within an IC for optimal power and performance targets. On a same die, an SOC includes one or more processing units and a input/output (I/O) controller (IOC). The multiple interfaces within the IOC manage packets and messages according multiple different protocols. The IOC maintains an activity level for each one of the multiple interfaces. This activity level may be based at least on a respective number of transactions executed by a corresponding one of the multiple interfaces. The IOC determines a power estimate for itself based on at least the activity levels. In response to detecting a difference between the power estimate and an assigned I/O power limit for the IOC, a power manager adjusts at least respective power limits for the one or more processing units based on at least the difference.

System and method for determining a power estimate for an I/O controller based on monitored activity levels and adjusting power limit of processing units by comparing the power estimate with an assigned power limit for the I/O controller

In response to entering a secure mode a processor disables access to first predetermined processor information through a sideband interface, while maintaining access to second predetermined processor information through the sideband interface. In the processor, a first interface portion of the sideband interface may provide access to the first predetermined processor information and a second interface portion of the sideband interface may provide access to the second predetermined processor information. The first interface portion is enabled in response to a power-on sequence and is selectably enabled under software control after being disabled on entering the secure mode. The second and additional interface portions may provide access to information related to processor temperature, power management, or machine checks.

Method and apparatus for making a processor sideband interface adhere to secure mode restrictions

In one embodiment, an input/output (I/O) memory management unit (IOMMU) comprises at least one memory and control logic coupled to the memory. The memory is configured to store translation data corresponding to one or more I/O translation tables stored in a memory system of a computer system that includes the IOMMU. The control logic is configured to translate an I/O device-generated memory request using the translation data. The translation data includes a type field indicating one or more attributes of the translation, and the control logic is configured to control the translation responsive to the type field.

Using an IOMMU to create memory archetypes

In one embodiment, a system comprises one or more input/output (I/O) devices; an I/O memory management unit (IOMMU) coupled to receive memory requests sourced by the I/O devices and configured to provide address translation for the memory requests; and a virtual machine monitor (VMM) configured to manage one or more virtual machines on the system, wherein the VMM is configured to virtualize the IOMMU, providing one or more virtual IOMMUs for use by one or more virtual machines.

Virtualizing an IOMMU

In one embodiment, an input/output memory management unit (IOMMU) comprises a control register and control logic coupled to the control register. The control register is configured to store a base address of a device table, wherein a given input/output (I/O) device has an associated device identifier that selects a first entry in the device table. The first entry comprises a pointer to an interrupt remapping table. The control logic is configured to remap an interrupt specified by an interrupt request received by the IOMMU from the given I/O device if the interrupt remapping table includes an entry for the interrupt.

Filtering and remapping interrupts

In one embodiment, an input/output memory management unit (IOMMU) comprises a control register configured to store a base address of a set of translation tables and control logic coupled to the control register. The control logic is configured to respond to an input/output (I/O) device-initiated request having an address within an address range of an address space corresponding to a peripheral interconnect. One or more operations other than a memory operation are associated with the address range, and the control logic is configured to translate the address to a second address outside of the address range if the translation tables specify a translation from the address to the second address, whereby a memory operation is performed in response to the request instead of the one or more operations associated with the address range.

Efficiently controlling special memory mapped system accesses

In an embodiment, an input/output (I/O) memory management unit (IOMMU) comprises at least one memory configured to store translation data; and control logic coupled to the memory and configured to translate an I/O device-generated memory request using the translation data. The translation data corresponds to one or more device table entries in a device table stored in a memory system of a computer system that includes the IOMMU, wherein the device table entry for a given request is selected by an identifier corresponding to the I/O device that generates the request. The translation data further corresponds to one or more I/O page tables, wherein the selected device table entry for the given request includes a pointer to a set of I/O page tables to be used to translate the given request.

Direct memory access (DMA) address translation in an input/output memory management unit (IOMMU)

Input/output memory management unit that implements memory attributes based on translation data

Address translation for input/output (I/O) devices and interrupt remapping for I/O devices in an I/O memory management unit (IOMMU)

In one embodiment, an input/output (I/O) node comprises an I/O memory management unit (IOMMU) configured to translate memory requests. The I/O node is configured to couple to an interconnect and to operate as a tunnel on the interconnect, and wherein the IOMMU is configured translate memory requests passing through the tunnel in the upstream direction. In another embodiment, a system comprises another I/O node configured to bridge another interconnect to the interconnect, wherein the I/O node is the tunnel for the other I/O node.

Chained hybrid input/output memory management unit

Growing community of inventors

Austin, TX, United States of America

Andrew William Lueck