[PATCH v8 3/5] powerpc/papr_scm: Fetch nvdimm health information from PHYP

[Aneesh Kumar K.V]

Vaibhav Jain <vaibhav at linux.ibm.com> writes:

> 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-scm.
>
> [1] commit 58b278f568f0 ("powerpc: Provide initial documentation for
> PAPR hcalls")
>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>

> Cc: "Aneesh Kumar K . V" <aneesh.kumar at linux.ibm.com>
> Cc: Dan Williams <dan.j.williams at intel.com>
> Cc: Michael Ellerman <mpe at ellerman.id.au>
> Cc: Ira Weiny <ira.weiny at intel.com>
> Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>