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H A D | sysfs-bus-papr-pmem | b791abf3201d724ac372c2ba1fa6e90d192e1dbf Mon Jun 15 14:44:04 CEST 2020 Vaibhav Jain <vaibhav@linux.ibm.com> powerpc/papr_scm: Fetch nvdimm health information from PHYP
Implement support for fetching nvdimm health information via H_SCM_HEALTH hcall as documented in Ref[1]. The hcall returns a pair of 64-bit bitmap, bitwise-and of which is then stored in 'struct papr_scm_priv' and subsequently partially exposed to user-space via newly introduced dimm specific attribute 'papr/flags'. Since the hcall is costly, the health information is cached and only re-queried, 60s after the previous successful hcall.
The patch also adds a documentation text describing flags reported by the the new sysfs attribute 'papr/flags' is also introduced at Documentation/ABI/testing/sysfs-bus-papr-pmem.
[1] commit 58b278f568f0 ("powerpc: Provide initial documentation for PAPR hcalls")
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com> Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Ira Weiny <ira.weiny@intel.com> Link: https://lore.kernel.org/r/20200615124407.32596-4-vaibhav@linux.ibm.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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