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