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