Re: [dmidecode] [PATCH] dmidecode: Add option to filter output based upon handle

Fri, 29 Jun 2018 07:01:29 -0700 


> -----Original Message-----
> From: Jean Delvare <[email protected]>
> Sent: Friday, June 29, 2018 4:09 AM
> To: Hoemann, Jerry <[email protected]>
> Cc: [email protected]; Elliott, Robert (Persistent Memory)
> <[email protected]>
> Subject: Re: [PATCH] dmidecode: Add option to filter output based
> upon handle
> 
> Hi Jerry,
> 
> On Thu, 28 Jun 2018 14:08:06 -0600, Jerry Hoemann wrote:
> > Add option "--handle HANDLE" to dmiopt to allow user to filter
> > ouput to only those entrie(s) that match HANDLE.
> 
> I am curious what you need this feature for? Handle numbers are
> arbitrary and not portable, so it never occurred to me that someone
> could need to query for a specific handle.

The ACPI NFIT (NVDIMM Firmware Interface Table) reports the SMBIOS
handle of each NVDIMM (in a field called Physical ID).  So, this
helps follow that to find the rest of the information about the
NVDIMM that is being provided by system firmware.
See https://patchwork.kernel.org/patch/9835987/.

Similarly, the ACPI PMTT (Platform Memory Topology Table) and HMAT 
(Heterogeneous Memory Attribute Table) include SMBIOS handles for
the DIMMs whose attributes they are describing.

---
Robert Elliott, HPE Persistent Memory



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