Processing Diagnostic Requests for Direct Block Access Storage Devices

• US 20110072209A1
• Filed: 09/01/2010
• Published: 03/24/2011
• Est. Priority Date: 09/23/2009
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Corporation (Broadcom, Inc.)
• Inventors: Forhan, Carl, Rysavy, Randal S., Swatosh, Timothy, Lund, Timothy
• Granted Patent: US 8,762,789 B2
• Time in Patent Office: Days
• US Class Current: 711/114
• CPC Class Codes: G06F 12/0246 in block erasable memory, e.g. flash memory
• CPC Class Codes: G06F 12/1027 using associative or pseudo-associative address translation means, e.g. translation look-aside buffer [TLB]
• CPC Class Codes: G06F 13/14 Handling requests for interconnection or transfer
• CPC Class Codes: G06F 13/24 using interrupt G06F13/32 takes precedence
• CPC Class Codes: G06F 2212/7201 Logical to physical mapping or translation of blocks or pages
• CPC Class Codes: G06F 2212/7203 Temporary buffering, e.g. using volatile buffer or dedicated buffer blocks
• CPC Class Codes: G06F 2213/0028 Serial attached SCSI [SAS]
• CPC Class Codes: G06F 3/00 Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements

Abstract

Described embodiments provide a media controller for processing a diagnostic request received from a diagnostic source. The received diagnostic request is parsed by a corresponding request handling module of the media controller, where each diagnostic source type has a corresponding request handling module. If the received diagnostic request requires allocation of buffer space, a common diagnostic handling module of the media controller allocates buffer space in a buffer for the received diagnostic request. The common diagnostic handling module is common for all diagnostic source types. The common diagnostic handling module provides the received diagnostic request to a corresponding one of a plurality of end diagnostic handling modules. The end diagnostic handling module performs the diagnostic tasks. If the received diagnostic request requires a transfer of data to the diagnostic source, the common diagnostic handling module performs the data transfer between the media controller and the diagnostic source.

Claims

1. A method of processing, by a media controller, a diagnostic request received from a diagnostic source, the method comprising:

parsing, by a corresponding request handling module of the media controller, the received diagnostic request;

if the received diagnostic request requires allocation of buffer space;

allocating, by a common diagnostic handling module of the media controller, buffer space in a buffer of the media controller for the received diagnostic request;

providing, by the common diagnostic handling module, the received diagnostic request to a corresponding one of a plurality of end diagnostic handling modules of the media controller;

performing, by the end diagnostic handling module, one or more diagnostic tasks of the received diagnostic request;

if the received diagnostic request requires a transfer of data to the diagnostic source;

performing, by the common diagnostic handling module, the data transfer between the media controller and the diagnostic source; and

deallocating, by the common diagnostic handling module, the allocated buffer space,

wherein each diagnostic task is performed by a corresponding one of the plurality of end diagnostic handling modules, each diagnostic source type has a corresponding request handling module, and the common diagnostic handling module is common for all diagnostic source types.

2. The method recited in claim 1, further comprising:

if the received diagnostic request requires a transfer of data from the diagnostic source;

performing, by the common diagnostic handling module, the data transfer between the diagnostic source and the media controller.

3. The method recited in claim 1, further comprising:

providing a response signal, by the common diagnostic handling module to the corresponding request handling module of the received diagnostic request.

4. The method recited in claim 3, wherein the response signal comprises a status of the diagnostic request.

5. The method recited in claim 1, wherein the diagnostic task comprises one of reading and writing an address of one of the buffer of the media controller and a media coupled to the media controller, reading and writing a register of the media controller, reporting status data of the media controller, and updating firmware of the media controller.

6. The method recited in claim 1, wherein the diagnostic source comprises one of a host source, a debugger source, and a miscellaneous source.

7. The method recited in claim 6, wherein the host source comprises one of a SATA source and a SAS source.

8. The method recited in claim 6, wherein the debugger source comprises one of a Joint Test Action Group (JTAG) source and a Serial Wire Debug (SWD) source.

9. The method recited in claim 6, wherein the miscellaneous source comprises one of a Serial Peripheral Interface (SPI) or a Universal Asynchronous Receiver/Transmitter (UART).

21. The method of claim 5, wherein the media coupled to the media controller is a Redundant Array of Independent Disks (RAID) system comprising a plurality of storage devices and at least one media controller coupled to at least one corresponding storage device.

10. A media controller comprising:

a plurality of communication links coupled to one or more diagnostic sources;

a plurality of request handling modules each corresponding to one of the plurality of communication links, the request handling modules adapted to receive a diagnostic request from a diagnostic source coupled to the corresponding communication link;

a common diagnostic handling module adapted to i) allocate buffer space in a buffer of the media controller, if the received diagnostic request requires allocation of buffer space, ii) provide the received diagnostic request to a corresponding one of a plurality of end diagnostic handling modules, iii) perform data transfer between the media controller and the diagnostic source, and iv) deallocate, when the received diagnostic request is complete, any allocated buffer space;

wherein the corresponding end diagnostic handling module is adapted to perform one or more diagnostic tasks of the received diagnostic request, and

wherein each request handling module corresponds to a diagnostic source type and the common diagnostic handling module is common for all diagnostic source types.

11. The media controller recited in claim 10, wherein the common diagnostic handling module is adapted to provide a response signal to the corresponding request handling module of the received diagnostic request, the response signal comprising a status of the diagnostic request.

12. The media controller recited in claim 10, wherein each diagnostic task is performed by a corresponding one of the plurality of end diagnostic handling modules, and wherein the diagnostic task comprises one of reading and writing an address of one of the buffer of the media controller and a media coupled to the media controller, reading and writing a register of the media controller, reporting status data of the media controller, and updating firmware of the media controller.

13. The media controller recited in claim 10, wherein the diagnostic source comprises one of a host source, a debugger source, and a miscellaneous source.

14. The media controller recited in claim 10, wherein the host source comprises one of a SATA source and a SAS source, the debugger source comprises one of a Joint Test Action Group (JTAG) source and a Serial Wire Debug (SWD) source, and the miscellaneous source comprises one of a Serial Peripheral Interface (SPI) or a Universal Asynchronous Receiver/Transmitter (UART).

15. The media controller recited in claim 10, wherein the media controller is implemented in a monolithic integrated circuit chip.

16. A machine-readable storage medium, having encoded thereon program code, wherein, when the program code is executed by a machine, the machine implements a method of processing, by a media controller, a diagnostic request received from a diagnostic source, the method comprising:

parsing, by a corresponding request handling module of the media controller, the received diagnostic request;

if the received diagnostic request requires allocation of buffer space;

allocating, by a common diagnostic handling module of the media controller, buffer space in a buffer of the media controller for the received diagnostic request;

providing, by the common diagnostic handling module, the received diagnostic request to a corresponding one of a plurality of end diagnostic handling modules of the media controller;

performing, by the end diagnostic handling module, one or more diagnostic tasks of the received diagnostic request;

if the received diagnostic request requires a transfer of data to the diagnostic source;

performing, by the common diagnostic handling module, the data transfer between the media controller and the diagnostic source; and

deallocating, by the common diagnostic handling module, the allocated buffer space,

wherein each diagnostic task is performed by a corresponding one of the plurality of end diagnostic handling modules, each diagnostic source type has a corresponding request handling module, and the common diagnostic handling module is common for all diagnostic source types.

17. The machine-readable storage medium recited in claim 16, further comprising:

if the received diagnostic request requires a transfer of data from the diagnostic source;

performing, by the common diagnostic handling module, the data transfer between the diagnostic source and the media controller.

18. The machine-readable storage medium recited in claim 16, further comprising:

providing a response signal, by the common diagnostic handling module to the corresponding request handling module of the received diagnostic request.

19. The machine-readable storage medium recited in claim 18, wherein the response signal comprises a status of the diagnostic request.

20. The machine-readable storage medium recited in claim 16, wherein the diagnostic task comprises one of reading and writing an address of one of the buffer of the media controller and a media coupled to the media controller, reading and writing a register of the media controller, reporting status data of the media controller, and updating firmware of the media controller.