1What: /sys/bus/nd/devices/nmemX/papr/flags 2Date: Apr, 2020 3KernelVersion: v5.8 4Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev, 5Description: 6 (RO) Report flags indicating various states of a 7 papr-pmem NVDIMM device. Each flag maps to a one or 8 more bits set in the dimm-health-bitmap retrieved in 9 response to H_SCM_HEALTH hcall. The details of the bit 10 flags returned in response to this hcall is available 11 at 'Documentation/powerpc/papr_hcalls.rst' . Below are 12 the flags reported in this sysfs file: 13 14 * "not_armed" 15 Indicates that NVDIMM contents will not 16 survive a power cycle. 17 * "flush_fail" 18 Indicates that NVDIMM contents 19 couldn't be flushed during last 20 shut-down event. 21 * "restore_fail" 22 Indicates that NVDIMM contents 23 couldn't be restored during NVDIMM 24 initialization. 25 * "encrypted" 26 NVDIMM contents are encrypted. 27 * "smart_notify" 28 There is health event for the NVDIMM. 29 * "scrubbed" 30 Indicating that contents of the 31 NVDIMM have been scrubbed. 32 * "locked" 33 Indicating that NVDIMM contents cant 34 be modified until next power cycle. 35 36What: /sys/bus/nd/devices/nmemX/papr/perf_stats 37Date: May, 2020 38KernelVersion: v5.9 39Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev, 40Description: 41 (RO) Report various performance stats related to papr-scm NVDIMM 42 device. This attribute is only available for NVDIMM devices 43 that support reporting NVDIMM performance stats. Each stat is 44 reported on a new line with each line composed of a 45 stat-identifier followed by it value. Below are currently known 46 dimm performance stats which are reported: 47 48 * "CtlResCt" : Controller Reset Count 49 * "CtlResTm" : Controller Reset Elapsed Time 50 * "PonSecs " : Power-on Seconds 51 * "MemLife " : Life Remaining 52 * "CritRscU" : Critical Resource Utilization 53 * "HostLCnt" : Host Load Count 54 * "HostSCnt" : Host Store Count 55 * "HostSDur" : Host Store Duration 56 * "HostLDur" : Host Load Duration 57 * "MedRCnt " : Media Read Count 58 * "MedWCnt " : Media Write Count 59 * "MedRDur " : Media Read Duration 60 * "MedWDur " : Media Write Duration 61 * "CchRHCnt" : Cache Read Hit Count 62 * "CchWHCnt" : Cache Write Hit Count 63 * "FastWCnt" : Fast Write Count 64 65What: /sys/bus/nd/devices/nmemX/papr/health_bitmap_inject 66Date: Jan, 2022 67KernelVersion: v5.17 68Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev, 69Description: 70 (RO) Reports the health bitmap inject bitmap that is applied to 71 bitmap received from PowerVM via the H_SCM_HEALTH. This is used 72 to forcibly set specific bits returned from Hcall. These is then 73 used to simulate various health or shutdown states for an nvdimm 74 and are set by user-space tools like ndctl by issuing a PAPR DSM. 75 76