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Presently PAPR doesn't support injecting smart errors on an
NVDIMM. This makes testing the NVDIMM health reporting functionality
difficult as simulating NVDIMM health related events need a hacked up
qemu version.
To solve this problem this patch proposes simulating certain set of
NVDIMM health related events in papr_scm. Specifically 'fatal' health
state and 'dirty' shutdown state. These error can be injected via the
user-space 'ndctl-inject-smart(1)' command. With the proposed patch and
corresponding ndctl patches following command flow is expected:
$ sudo ndctl list -DH -d nmem0
...
"health_state":"ok",
"shutdown_state":"clean",
...
# inject unsafe shutdown and fatal health error
$ sudo ndctl inject-smart nmem0 -Uf
...
"health_state":"fatal",
"shutdown_state":"dirty",
...
# uninject all errors
$ sudo ndctl inject-smart nmem0 -N
...
"health_state":"ok",
"shutdown_state":"clean",
...
The patch adds a new member 'health_bitmap_inject_mask' inside struct
papr_scm_priv which is then bitwise ANDed to the health bitmap fetched from the
hypervisor. The value for 'health_bitmap_inject_mask' is accessible from sysfs
at nmemX/papr/health_bitmap_inject.
A new PDSM named 'SMART_INJECT' is proposed that accepts newly
introduced 'struct nd_papr_pdsm_smart_inject' as payload thats
exchanged between libndctl and papr_scm to indicate the requested
smart-error states.
When the processing the PDSM 'SMART_INJECT', papr_pdsm_smart_inject()
constructs a pair or 'inject_mask' and 'clear_mask' bitmaps from the payload
and bit-blt it to the 'health_bitmap_inject_mask'. This ensures the after being
fetched from the hypervisor, the health_bitmap reflects requested smart-error
states.
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220124202204.1488346-1-vaibhav@linux.ibm.com
75 lines
2.8 KiB
Text
75 lines
2.8 KiB
Text
What: /sys/bus/nd/devices/nmemX/papr/flags
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Date: Apr, 2020
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KernelVersion: v5.8
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Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev,
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Description:
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(RO) Report flags indicating various states of a
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papr-pmem NVDIMM device. Each flag maps to a one or
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more bits set in the dimm-health-bitmap retrieved in
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response to H_SCM_HEALTH hcall. The details of the bit
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flags returned in response to this hcall is available
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at 'Documentation/powerpc/papr_hcalls.rst' . Below are
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the flags reported in this sysfs file:
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* "not_armed"
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Indicates that NVDIMM contents will not
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survive a power cycle.
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* "flush_fail"
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Indicates that NVDIMM contents
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couldn't be flushed during last
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shut-down event.
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* "restore_fail"
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Indicates that NVDIMM contents
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couldn't be restored during NVDIMM
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initialization.
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* "encrypted"
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NVDIMM contents are encrypted.
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* "smart_notify"
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There is health event for the NVDIMM.
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* "scrubbed"
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Indicating that contents of the
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NVDIMM have been scrubbed.
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* "locked"
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Indicating that NVDIMM contents cant
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be modified until next power cycle.
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What: /sys/bus/nd/devices/nmemX/papr/perf_stats
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Date: May, 2020
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KernelVersion: v5.9
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Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev,
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Description:
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(RO) Report various performance stats related to papr-scm NVDIMM
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device. This attribute is only available for NVDIMM devices
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that support reporting NVDIMM performance stats. Each stat is
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reported on a new line with each line composed of a
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stat-identifier followed by it value. Below are currently known
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dimm performance stats which are reported:
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* "CtlResCt" : Controller Reset Count
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* "CtlResTm" : Controller Reset Elapsed Time
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* "PonSecs " : Power-on Seconds
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* "MemLife " : Life Remaining
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* "CritRscU" : Critical Resource Utilization
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* "HostLCnt" : Host Load Count
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* "HostSCnt" : Host Store Count
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* "HostSDur" : Host Store Duration
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* "HostLDur" : Host Load Duration
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* "MedRCnt " : Media Read Count
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* "MedWCnt " : Media Write Count
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* "MedRDur " : Media Read Duration
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* "MedWDur " : Media Write Duration
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* "CchRHCnt" : Cache Read Hit Count
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* "CchWHCnt" : Cache Write Hit Count
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* "FastWCnt" : Fast Write Count
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What: /sys/bus/nd/devices/nmemX/papr/health_bitmap_inject
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Date: Jan, 2022
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KernelVersion: v5.17
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Contact: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>, nvdimm@lists.linux.dev,
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Description:
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(RO) Reports the health bitmap inject bitmap that is applied to
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bitmap received from PowerVM via the H_SCM_HEALTH. This is used
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to forcibly set specific bits returned from Hcall. These is then
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used to simulate various health or shutdown states for an nvdimm
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and are set by user-space tools like ndctl by issuing a PAPR DSM.
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