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- What: /sys/bus/nd/devices/nmemX/papr/flags
- Date: Apr, 2020
- KernelVersion: v5.8
- Contact: linuxppc-dev <[email protected]>, [email protected],
- 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/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 cant
- be modified until next power cycle.
- What: /sys/bus/nd/devices/nmemX/papr/perf_stats
- Date: May, 2020
- KernelVersion: v5.9
- Contact: linuxppc-dev <[email protected]>, [email protected],
- 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 <[email protected]>, [email protected],
- 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.
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