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From: Vaibhav Jain <vaibhav@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-nvdimm@lists.01.org
Subject: [PATCH v3 0/2] powerpc/papr_scm: add support for reporting NVDIMM
 'life_used_percentage' metric
Date: Thu, 30 Jul 2020 17:43:01 +0530
Message-Id: <20200730121303.134230-1-vaibhav@linux.ibm.com>
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Cc: Santosh Sivaraj <santosh@fossix.org>, Oliver O'Halloran <oohall@gmail.com>,
 "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
 Vaibhav Jain <vaibhav@linux.ibm.com>, Dan Williams <dan.j.williams@intel.com>,
 Ira Weiny <ira.weiny@intel.com>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

Changes since v2[1]:

* Updated drc_pmem_query_stats() to reduce the number of input args
  to the function based suggestions from Aneesh.

[1] https://lore.kernel.org/linux-nvdimm/20200726122030.31529-1-vaibhav@linux.ibm.com
---

This small patchset implements kernel side support for reporting
'life_used_percentage' metric in NDCTL with dimm health output for
papr-scm NVDIMMs. With corresponding NDCTL side changes output for
should be like:

$ sudo ndctl list -DH
[
  {
    "dev":"nmem0",
    "health":{
      "health_state":"ok",
      "life_used_percentage":0,
      "shutdown_state":"clean"
    }
  }
]

PHYP supports H_SCM_PERFORMANCE_STATS hcall through which an LPAR can
fetch various performance stats including 'fuel_gauge' percentage for
an NVDIMM. 'fuel_gauge' metric indicates the usable life remaining of
an NVDIMM expressed as percentage and  'life_used_percentage' can be
calculated as 'life_used_percentage = 100 - fuel_gauge'.

Structure of the patchset
=========================
First patch implements necessary scaffolding needed to issue the
H_SCM_PERFORMANCE_STATS hcall and fetch performance stats
catalogue. The patch also implements support for 'perf_stats' sysfs
attribute to report the full catalogue of supported performance stats
by PHYP.

Second and final patch implements support for sending this value to
libndctl by extending the PAPR_PDSM_HEALTH pdsm payload to add a new
field named 'dimm_fuel_gauge' to it.

Vaibhav Jain (2):
  powerpc/papr_scm: Fetch nvdimm performance stats from PHYP
  powerpc/papr_scm: Add support for fetching nvdimm 'fuel-gauge' metric

 Documentation/ABI/testing/sysfs-bus-papr-pmem |  27 +++
 arch/powerpc/include/uapi/asm/papr_pdsm.h     |   9 +
 arch/powerpc/platforms/pseries/papr_scm.c     | 199 ++++++++++++++++++
 3 files changed, 235 insertions(+)

-- 
2.26.2