| What: /sys/bus/nd/devices/nmemX/papr/flags |
| Date: Apr, 2020 |
| KernelVersion: v5.8 |
| Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev, |
| Description: |
| (RO) Report flags indicating various states of a |
| papr-pmem NVDIMM device. Each flag maps to a one or |
| more bits set in the dimm-health-bitmap retrieved in |
| response to H_SCM_HEALTH hcall. The details of the bit |
| flags returned in response to this hcall is available |
| at 'Documentation/arch/powerpc/papr_hcalls.rst' . Below are |
| the flags reported in this sysfs file: |
| |
| * "not_armed" |
| Indicates that NVDIMM contents will not |
| survive a power cycle. |
| * "flush_fail" |
| Indicates that NVDIMM contents |
| couldn't be flushed during last |
| shut-down event. |
| * "restore_fail" |
| Indicates that NVDIMM contents |
| couldn't be restored during NVDIMM |
| initialization. |
| * "encrypted" |
| NVDIMM contents are encrypted. |
| * "smart_notify" |
| There is health event for the NVDIMM. |
| * "scrubbed" |
| Indicating that contents of the |
| NVDIMM have been scrubbed. |
| * "locked" |
| Indicating that NVDIMM contents can't |
| be modified until next power cycle. |
| |
| What: /sys/bus/nd/devices/nmemX/papr/perf_stats |
| Date: May, 2020 |
| KernelVersion: v5.9 |
| Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev, |
| Description: |
| (RO) Report various performance stats related to papr-scm NVDIMM |
| device. This attribute is only available for NVDIMM devices |
| that support reporting NVDIMM performance stats. Each stat is |
| reported on a new line with each line composed of a |
| stat-identifier followed by it value. Below are currently known |
| dimm performance stats which are reported: |
| |
| * "CtlResCt" : Controller Reset Count |
| * "CtlResTm" : Controller Reset Elapsed Time |
| * "PonSecs " : Power-on Seconds |
| * "MemLife " : Life Remaining |
| * "CritRscU" : Critical Resource Utilization |
| * "HostLCnt" : Host Load Count |
| * "HostSCnt" : Host Store Count |
| * "HostSDur" : Host Store Duration |
| * "HostLDur" : Host Load Duration |
| * "MedRCnt " : Media Read Count |
| * "MedWCnt " : Media Write Count |
| * "MedRDur " : Media Read Duration |
| * "MedWDur " : Media Write Duration |
| * "CchRHCnt" : Cache Read Hit Count |
| * "CchWHCnt" : Cache Write Hit Count |
| * "FastWCnt" : Fast Write Count |
| |
| What: /sys/bus/nd/devices/nmemX/papr/health_bitmap_inject |
| Date: Jan, 2022 |
| KernelVersion: v5.17 |
| Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev, |
| Description: |
| (RO) Reports the health bitmap inject bitmap that is applied to |
| bitmap received from PowerVM via the H_SCM_HEALTH. This is used |
| to forcibly set specific bits returned from Hcall. These is then |
| used to simulate various health or shutdown states for an nvdimm |
| and are set by user-space tools like ndctl by issuing a PAPR DSM. |
| |
