What: /sys/bus/nd/devices/nmemX/papr/flags Date: Apr, 2020 KernelVersion: v5.8 Contact: linuxppc-dev , 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 , 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 , 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.