Apparatus and method for enumeration of processors during hot-plug of a compute node

• US 20030065752A1
• Filed: 10/03/2001
• Published: 04/03/2003
• Est. Priority Date: 10/03/2001
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Kumar, Mohan J., Kaushik, Shivnandan D., Rankin, Linda J., Crossland, James B., OʼShea, David J.
• Granted Patent: US 7,493,438 B2
• Time in Patent Office: Days
• US Class Current: 709/220
• CPC Class Codes: G06F 13/4081 Live connection to bus, e.g. hot-plugging current or voltage limitation during live insertion H02H9/004

Abstract

An apparatus and method for enumeration of processors during hot-plug of a compute node are described. The method includes the enumeration, in response to a hot-plug reset, of one or more processors. The enumeration is provided to a system architecture operating system in which a compute node is hot-plugged. Once enumeration is complete, the compute node is started in response to an operating system activation request. Accordingly, once device enumeration, as well as resource enumeration are complete, the one or more processors of the processor memory node are activated, such that the operating system may begin utilizing the processors of the hot-plugged compute node.

Claims

1. A method comprising:

enumerating, in response to a hot-plug reset, one or more processors to a system architecture operating system in which a compute node is hot-plugged; and

starting, in response to an operating system activation request, the one or more processors of the compute node.

2. The method of claim 1, wherein enumerating further comprises:

setting a respective processor ID of each of the one or more detected processors, coupled to the compute node, to a respective unique value; and

initiating a handshake with the operating system, to thereby provide hot-plug notification to the operating system.

3. The method of claim 2, wherein setting the respective processor ID further comprises:

selecting a processor from the one or more detected processors;

generating, for the selected processor, a unique ID according to a processor number of the selected processor and a node ID of the compute node;

updating a processor ID within the selected processor according to the generated, unique ID; and

repeating the selecting, generating and updating for each of the one or more detected processors.

4. The method of claim 2, wherein initiating the handshake further comprises:

enabling a node link of the compute node, such that communication with a system architecture port is activated; and

directing the compute node to issue, via the link, a system interrupt.

5. The method of claim 4, further comprising:

initiating, by the operating system, a platform subsystem in response to the system interrupt;

providing hot-plug event notification to the platform subsystem; and

running, by the platform subsystem, a resource enumeration procedure to enumerate resources of the one or more detected processors.

6. The method of claim 4, wherein enabling the node link further comprises:

setting a node port register to direct the compute node to enable the node link;

issuing a request to the compute node to issue a system control interrupt; and

initiating, by the operating system, a platform subsystem in response to the system control interrupt.

7. The method of claim 1, further comprising:

detecting one or more processors coupled to the compute node; and

setting a respective node processor register for each detected processor to enable enumeration of each detected processor to the operating system.

8. The method of claim 3, wherein selecting a processor further comprises:

querying a node processor register to determine a processor capacity value of the compute node;

selecting a respective processor port of the compute node;

determining when a processor is loaded within the processor port of the compute node;

when a processor is detected, setting a corresponding processor node register value to indicate presence of the detected processor; and

repeating the selecting, determining and setting for each of the one or more detected processors according to the processor capacity value, such that each processor ID is set according to a respective processor node register value.

9. The method of claim 2, wherein setting of the processor ID further comprises:

selecting, from a respective processor node register, a corresponding processor number for a respective detected processor;

concatenating the selected processor number with a node register to form a unique ID;

replacing a processor ID of the respective processor with the unique ID; and

repeating the selecting and concatenating for each of the one or more detected processors.

10. A method comprising:

initiating, in response to hot-plug notification, an enumeration procedure;

enumerating, by the enumeration procedure, resources of one or more detected processor to a system architecture operating system in which a compute node is hot-plugged; and

transmitting an activation request to the one or more processor of the hot-plugged compute node.

11. The method of claim 10, wherein initiating further comprises:

detecting an interrupt;

initiating, in response to the interrupt, a system control interrupt to thereby direct the operating system to launch a platform subsystem; and

once the platform subsystem is launched, issuing resource enumeration event notification to the platform subsystem.

12. The method of claim 10, wherein enumerating further comprises:

launching, in response to resource event notification, the enumeration procedure;

detecting, in response to processor enumeration, one or more processors coupled to the hot-plugged compute node;

detecting, in response to processor enumeration, one or more resources required by the one or more detected processors; and

updating a processor device structure with each detected processor ID and resource, thereby enumerating the one or more detected processors and the resources of the one or more detected processors to the operating system.

13. The method of claim 12, wherein detecting further comprises:

selecting a corresponding processor node register value of the compute node;

when a processor node register value is set, detecting a processor; and

repeating the selecting and detecting for each processor node register value of the compute node to detect the one or more processors.

14. The method of claim 12, wherein detecting further comprises:

selecting, from a respective processor node register, a corresponding processor number for a respective detected processor;

concatenating the selected processor number with a node register ID value to determine a processor ID for the respective processor;

replacing a processor ID of the respective processor with the unique ID; and

repeating the selecting and concatenating for each of the one or more detected processors to determine a processor ID for each of the one or more detected processors.

15. A computer readable storage medium including program instructions that direct a computer to function in a specified manner when executed by a processor, the program instructions comprising:

enumerating, in response to a hot-plug reset, one or more processors to a system architecture operating system in which a compute node is hot-plugged; and

starting, in response to an operating system activation request, the one or more processors of the compute node.

16. The computer readable storage medium of claim 15, wherein enumerating further comprises:

setting a respective processor ID of each of the one or more detected processors, coupled to the compute node, to a respective unique value; and

initiating a handshake with the operating system, to thereby provide hot-plug notification to the operating system.

17. The computer readable storage medium of claim 16, wherein setting the respective processor ID further comprises:

selecting a processor from the one or more detected processors;

generating, for the selected processor, the unique ID according to a processor number of the selected processor and a node ID of the compute node;

updating a processor ID within the selected memory processor according to the generated, unique ID; and

repeating the selecting, generating and updating for each of the one or more detected processors.

18. The computer readable storage medium of claim 16, wherein initiating the handshake further comprises:

enabling a node link of the compute node, such that communication with a system architecture port is activated; and

directing the compute node to issue, via the link, to a system interrupt.

19. The computer readable storage medium of claim 18, further comprising:

initiating, by the operating system, a platform subsystem in response to the system interrupt;

providing hot-plug event notification to the platform subsystem; and

running, by the platform subsystem, a resource enumeration procedure to enumerate resources of the one or more detected processors.

20. The computer readable storage medium of claim 18, wherein enabling the node link further comprises:

setting a node port register to direct the compute node to enable the node link;

issuing a request to the compute node to issue a system control interrupt; and

initiating, by the operating system, a platform subsystem in response to the system control interrupt.

21. The computer readable storage medium of claim 15, further comprising:

detecting one or more processors coupled to the compute node; and

setting a respective node processor register for each detected processor to enable enumeration of each detected processor to the operating system.

22. The computer readable storage medium of claim 17, wherein selecting a processor further comprises:

querying a node processor register to determine a processor capacity value of the compute node;

selecting a respective node port of the compute node;

determining when a processor is loaded within the processor port of the compute node;

when a processor is detected, setting a corresponding processor node register value to indicate presence of the detected processor; and

repeating the selecting, determining and setting for each of the one or more detected processors, according to the processor capacity value, such that each processor ID is set according to the respective processor node register value.

23. The computer readable storage medium of claim 16, wherein setting of the processor ID further comprises:

selecting, from a respective processor node register, a corresponding processor number for a respective detected processor;

concatenating the selected value with a node register ID value to form the unique processor ID;

replacing a processor ID of the respective detected processor with the unique ID; and

repeating the selecting and concatenating for each of the one or more detected processors.

24. A computer readable storage medium including program instructions that direct a computer to function in a specified manner when executed by a processor, the program instructions comprising:

initiating, in response to hot-plug notification, an enumeration procedure;

enumerating, by the enumeration procedure, resources of one or more detected processor to a system architecture operating system in which a compute node is hot-plugged; and

transmitting an activation request to the one or more processor of the hot-plugged compute node.

25. The computer readable storage medium of claim 24, wherein initiating further comprises:

detecting an interrupt;

initiating, in response to the interrupt, a system control interrupt to thereby direct the operating system to launch a platform subsystem; and

issuing resource enumeration event notification to the platform subsystem.

26. The computer readable storage medium of claim 24, wherein enumerating further comprises:

launching, in response to the resource even notification, the enumeration procedure;

detecting, in response to processor enumeration, one or more processors coupled to the hot-plugged compute node;

detecting, in response to processor enumeration, one or more resources required by the one or more detected processors; and

updating a processor device structure with each detected processor ID and resource, thereby enumerating the one or more detected processors and the resources of the one or more detected processors to the operating system.

27. The computer readable storage medium of claim 26, wherein detecting one or more processors further comprises:

selecting a corresponding processor node register value of the compute node;

when a processor node register value is set, detecting a processor; and

repeating the selecting and detecting for each processor node register value of the compute node to detect the one or more processors.

28. The computer readable storage medium of claim 26 wherein detecting one or more processors further comprises:

selecting, from a respective processor node register, a corresponding processor number for a respective detected processor;

concatenating the selected processor number with a node register ID value to determine a processor ID for the respective processor;

replacing a processor ID of the respective processor with the unique ID; and

repeating the selecting and concatenating for each of the one or more detected processors to determine a processor ID for each of the one or more detected processors.

29. An apparatus, comprising:

a compute node, including one or more processors coupled thereto, each link coupled to the mode, the link to enable plug in to a system architecture port; and

a storage device coupled to the compute node, having sequences of instructions stored therein, which when executed by the compute node cause the compute node to;

enumerate, in response to a hot-plug reset, detection of one or more processors to a system architecture operating system in which a compute node is hot-plugged, and

start, in response to an operating system activation request, the one or more processors.

30. The apparatus of claim 29, wherein the instruction to enumerate further causes the processor to:

set a respective processor ID of each of the one or more detected processors, coupled to the compute node, to a respective unique value; and

initiate a handshake with the operating system, to thereby provide hot-plug notification to the operating system.

31. The apparatus of claim 29, wherein the instruction to enumerate further causes the processor to:

query a node processor register to determine a processor capacity value of the compute node;

select a respective node port of the compute node;

determine when a processor is loaded within the processor port of the compute node;

when a processor is detected, set a corresponding processor node register value to indicate presence of the detected processor; and

repeat the select, determine and set for each of the one or more detected processors, according to the processor capacity value, such that each processor ID is set according to the respective processor node register value.

32. A system comprises:

an architecture platform including one or more ports for coupling to one or ore compute nodes;

a compute node, including one or more processors coupled thereto and one or more links, each link coupled to the node, the links to enable hot-plug into a system architecture port; and

a storage device coupled to the compute node, having sequences of instructions stored therein, which when executed by the compute node cause the compute node to;

enumerate, in response to a hot-plug reset, one or more processors to the architecture platform operating system in which the compute node is hot-plugged, and

start, in response to an operating system activation request, the one or more processors.

33. The system of claim 32, wherein the instruction to enumerate further comprises:

set a respective processor ID of each of the one or more detected processors, coupled to the compute node, to a respective unique value; and

initiate a handshake with the operating system, to thereby provide hot-plug notification to the operating system.

34. The system of claim 33, further comprising the instruction to:

initiate, in response to hot-plug notification, an enumeration procedure;

enumerate, by the enumeration procedure, resources of one or more detected processor to a system architecture operating system in which a compute node is hot-plugged; and

transmit an activation request to the one or more processor of the hot-plugged compute node.