| For all of the nmem device attributes under nfit/*, see the 'NVDIMM Firmware |
| Interface Table (NFIT)' section in the ACPI specification |
| (http://www.uefi.org/specifications) for more details. |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/serial |
| Date: Jun, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Serial number of the NVDIMM (non-volatile dual in-line |
| memory module), assigned by the module vendor. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/handle |
| Date: Apr, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) The address (given by the _ADR object) of the device on its |
| parent bus of the NVDIMM device containing the NVDIMM region. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/device |
| Date: Apr, 2015 |
| KernelVersion: v4.1 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Device id for the NVDIMM, assigned by the module vendor. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/rev_id |
| Date: Jun, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Revision of the NVDIMM, assigned by the module vendor. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/phys_id |
| Date: Apr, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Handle (i.e., instance number) for the SMBIOS (system |
| management BIOS) Memory Device structure describing the NVDIMM |
| containing the NVDIMM region. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/flags |
| Date: Jun, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) The flags in the NFIT memory device sub-structure indicate |
| the state of the data on the nvdimm relative to its energy |
| source or last "flush to persistence". |
| |
| The attribute is a translation of the 'NVDIMM State Flags' field |
| in section 5.2.25.3 'NVDIMM Region Mapping' Structure of the |
| ACPI specification 6.2. |
| |
| The health states are "save_fail", "restore_fail", "flush_fail", |
| "not_armed", "smart_event", "map_fail" and "smart_notify". |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/format |
| What: /sys/bus/nd/devices/nmemX/nfit/format1 |
| What: /sys/bus/nd/devices/nmemX/nfit/formats |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) The interface codes indicate support for persistent memory |
| mapped directly into system physical address space and / or a |
| block aperture access mechanism to the NVDIMM media. |
| The 'formats' attribute displays the number of supported |
| interfaces. |
| |
| This layout is compatible with existing libndctl binaries that |
| only expect one code per-dimm as they will ignore |
| nmemX/nfit/formats and nmemX/nfit/formatN. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/vendor |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Vendor id of the NVDIMM. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/dsm_mask |
| Date: May, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) The bitmask indicates the supported device specific control |
| functions relative to the NVDIMM command family supported by the |
| device |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/family |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Displays the NVDIMM family command sets. Values |
| 0, 1, 2 and 3 correspond to NVDIMM_FAMILY_INTEL, |
| NVDIMM_FAMILY_HPE1, NVDIMM_FAMILY_HPE2 and NVDIMM_FAMILY_MSFT |
| respectively. |
| |
| See the specifications for these command families here: |
| http://pmem.io/documents/NVDIMM_DSM_Interface-V1.6.pdf |
| https://github.com/HewlettPackard/hpe-nvm/blob/master/Documentation/ |
| https://msdn.microsoft.com/library/windows/hardware/mt604741" |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/id |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) ACPI specification 6.2 section 5.2.25.9, defines an |
| identifier for an NVDIMM, which refelects the id attribute. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/subsystem_vendor |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Sub-system vendor id of the NVDIMM non-volatile memory |
| subsystem controller. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/subsystem_rev_id |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Sub-system revision id of the NVDIMM non-volatile memory subsystem |
| controller, assigned by the non-volatile memory subsystem |
| controller vendor. |
| |
| |
| What: /sys/bus/nd/devices/nmemX/nfit/subsystem_device |
| Date: Apr, 2016 |
| KernelVersion: v4.7 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Sub-system device id for the NVDIMM non-volatile memory |
| subsystem controller, assigned by the non-volatile memory |
| subsystem controller vendor. |
| |
| |
| What: /sys/bus/nd/devices/ndbusX/nfit/revision |
| Date: Jun, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) ACPI NFIT table revision number. |
| |
| |
| What: /sys/bus/nd/devices/ndbusX/nfit/scrub |
| Date: Sep, 2016 |
| KernelVersion: v4.9 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RW) This shows the number of full Address Range Scrubs (ARS) |
| that have been completed since driver load time. Userspace can |
| wait on this using select/poll etc. A '+' at the end indicates |
| an ARS is in progress |
| |
| Writing a value of 1 triggers an ARS scan. |
| |
| |
| What: /sys/bus/nd/devices/ndbusX/nfit/hw_error_scrub |
| Date: Sep, 2016 |
| KernelVersion: v4.9 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RW) Provides a way to toggle the behavior between just adding |
| the address (cache line) where the MCE happened to the poison |
| list and doing a full scrub. The former (selective insertion of |
| the address) is done unconditionally. |
| |
| This attribute can have the following values written to it: |
| |
| '0': Switch to the default mode where an exception will only |
| insert the address of the memory error into the poison and |
| badblocks lists. |
| '1': Enable a full scrub to happen if an exception for a memory |
| error is received. |
| |
| |
| What: /sys/bus/nd/devices/ndbusX/nfit/dsm_mask |
| Date: Jun, 2017 |
| KernelVersion: v4.13 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) The bitmask indicates the supported bus specific control |
| functions. See the section named 'NVDIMM Root Device _DSMs' in |
| the ACPI specification. |
| |
| |
| What: /sys/bus/nd/devices/regionX/nfit/range_index |
| Date: Jun, 2015 |
| KernelVersion: v4.2 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) A unique number provided by the BIOS to identify an address |
| range. Used by NVDIMM Region Mapping Structure to uniquely refer |
| to this structure. Value of 0 is reserved and not used as an |
| index. |
| |
| |
| What: /sys/bus/nd/devices/regionX/nfit/ecc_unit_size |
| Date: Aug, 2017 |
| KernelVersion: v4.14 |
| Contact: linux-nvdimm@lists.01.org |
| Description: |
| (RO) Size of a write request to a DIMM that will not incur a |
| read-modify-write cycle at the memory controller. |
| |
| When the nfit driver initializes it runs an ARS (Address Range |
| Scrub) operation across every pmem range. Part of that process |
| involves determining the ARS capabilities of a given address |
| range. One of the capabilities that is reported is the 'Clear |
| Uncorrectable Error Range Length Unit Size' (see: ACPI 6.2 |
| section 9.20.7.4 Function Index 1 - Query ARS Capabilities). |
| This property indicates the boundary at which the NVDIMM may |
| need to perform read-modify-write cycles to maintain ECC (Error |
| Correcting Code) blocks. |
