Managing Persistent Memory Tiffany Kasanicky Intel

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1 Managing Persistent Memory Tiffany Kasanicky Intel 1

2 Agenda Managing* Be in charge of; administer; run. The process of dealing with or controlling things or people. Persistent Memory Memory that retains data when the power is off. *Courtesy of Google 2

3 Overview Management Block Persistent Memory User IXPDIMM SW St andard Raw Device Access St andard File API (EM Aware) St andard File API nvml Load/ St ore Kernel File System EM Aware FS (DAX) MMU Mappings NVDIMM Driver(s) BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) Learn more at FW Persistent Memory 3

4 Overview Management Block Persistent Memory User IXPDIMM SW St andard Raw Device Access St andard File API (EM Aware) St andard File API nvml Load/ St ore Kernel File System EM Aware FS (DAX) MMU Mappings NVDIMM Driver(s) BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) FW Persistent Memory 4

5 Overview Management Block Persistent Memory User IXPDIMM SW St andard Raw Device Access St andard File API (EM Aware) St andard File API nvml Load/ St ore Kernel File System EM Aware FS (DAX) MMU Mappings NVDIMM Driver(s) BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) FW Persistent Memory 5

6 NVDIMM Firmware Interface Table (NFIT) ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 6

7 NFIT Mapping Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 7

8 NFIT Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 8

9 Interface Format Code *As of ACPI Specification 6.0: 9

10 Management Information Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 10

11 NFIT Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 11

12 NFIT Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 12

13 NFIT Flush Hint Address Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 13

14 NFIT Block Data Window Structure ACPI NVM Root Device (in ACPI namespace) Implicit Association NFIT Management Information NVDIMM Mapping Structure Structure NVDIMM Block Data Window Structure Flush Hint Address *As of ACPI Specification 6.0: NFIT Device Handle Structure 14

15 Overview Management Block Persistent Memory User IXPDIMM SW St andard Raw Device Access St andard File API (EM Aware) St andard File API nvml Load/ St ore Kernel File System EM Aware FS (DAX) MMU Mappings NVDIMM Driver(s) BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) FW Persistent Memory 15

16 NVDIMM Root Device DSMs Query Command Implemented Query Address Range Scrub Capabilities Start Address Range Scrub Query Address Range Scrub Status Clear Uncorrectable Error Translate SPA Reserved ARS Error Inject ARS Error Inject Clear ARS Error Inject Status Query *As of ACPI Specification 6.2: 16

17 NVDIMM IFC 0x0201/0x0301* DSMs Query Command Implemented Get Supported Modes Get SMART and Health Info Get SMART Threshold Get Block NVDIMM Flags Get Command Effect Log Size Get Command Effect Log Pass-Through Command Enable Latch System Shutdown Status Get FW Info Start FW Update Send FW Update Data Finish FW Update Query Finish FW Update Status Set SMART Threshold Inject Error *Final values TBD based on JEDEC approval 17

18 Overview Management Block Persistent Memory User IXPDIMM SW St andard Raw Device Access St andard File API (EM Aware) St andard File API nvml Load/ St ore Kernel File System EM Aware FS (DAX) MMU Mappings NVDIMM Driver(s) BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) FW Persistent Memory 18

19 Linux 4.9+ *Courtesy of Dan Williams 19

20 Windows* Server 2016 Management Block Persistent Memory User IXPDIMM SW St andard File API (EM Aware) Setup nvml Load/ St ore Kernel Vendor Physical NVDIMM Driver Windows* SCM Bus Driver Windows* SCM Aware FS (NTFS-DAX) Windows* SCM Disk Driver MMU Mappings BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) FW Storage Class Memory * 20

21 Persistent Memory s NVDIMM0 NVDIMM1 NVDIMM2 NVDIMM3 21

22 Sets (s) Set Set NVDIMM0 NVDIMM1 NVDIMM2 NVDIMM3 22

23 Namespaces Set Namespace 2 Namespace 1 Set Namespace 0 NVDIMM0 NVDIMM1 NVDIMM2 NVDIMM3 23

24 Namespace Label Storage Area (LSA) Set Namespace 2 Namespace 1 Namespace Label Storage Area (LSA) Block Set Block Namespace 0 Label Label LSA LSA LSA LSA NVDIMM0 NVDIMM1 NVDIMM2 NVDIMM3... Label *As of UEFI Specification 2.7: 24

25 Namespace Label NVDIMM0 Set Namespace 2 NVDIMM1 Namespace 1 Set Namespace 0 NVDIMM2 LSA LSA LSA LSA NVDIMM3 *As of UEFI Specification 2.7: Namespace Label Storage Area (LSA) Block Block Label Label... Label Namespace Label UID Name Flags Nlabel Position Set Coo kie LBASize DPA RawSize Type GUID Abstraction GUID 25

26 Overview Management Block Persistent Memory User IXPDIMM SW St andard Raw Device Access St andard File API (EM Aware) St andard File API nvml Load/ St ore Kernel File System EM Aware FS (DAX) MMU Mappings NVDIMM Driver(s) BIOS _DSM ACPI (NFIT) UEFI SW NVDIMM(s) FW Persistent Memory 26

27 Intel DIMM UEFI SW Management UEFI Shell BMC Intel CLI OS HII Browser EFI File Syst em BDS BIOS HII Database Forms St rings Intel HII Driver Intel DIMM Driver ACPI Intel DIMM(s) FW Persistent Memory 27

28 Intel DIMM OS SW (IXPDIMM SW) Management Enterprise Tools WMI/Pegasus/SFCB User Syslog ixpdimmmonitor ixpdimm-cim libixpdimm ixpdimm-cli lnx_adapter esx_adapter win_adapter(s) sim_adapter Simulator libndctl libvmkusernvd Kernel pmem VMware Driver Intel DIMM Driver Windows SCM Disk Driver Windows SCM Bus Driver RHEL/SLES ESXi Windows RS3 BIOS _DSM ACPI (NFIT) Intel DIMM(s) FW Intel Partner 28

29 IXPDIMM SW Distribution Plan Open source 3- clause BSD license Targeted Distributions: RHEL 7.5 SLES 15 Fedora opensuse *Ubuntu Package ixpdimm sw nvm frameworks Repository

30 Persistent Memory Management Topology: NVDIMM discovery, identifying information, capabilities Sensors & Settings: Temperature, wear, spare, power, errors Memory Configuration: Mapped capacity into the SAS, interleave, failed interleave sets Performance: Bytes read/ written, read/write requests per AEP Namespaces: Create/delete/inventory namespaces Instrumentation: SW/FW version, FW update, settings and policies 30

31 Questions 31

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