Re: [PATCH] Add support of NVDIMM memory error notification in ACPI 6.2

[Kani, Toshimitsu]

On Thu, 2017-06-08 at 10:34 -0700, Dan Williams wrote:
> On Thu, Jun 8, 2017 at 10:30 AM, Linda Knippers <linda.knippers@xxxxx
> om> wrote:
> [..]
> > Wasn't Dan concerned about how the OS can know whether the FW
> > supports that bit in the Start ARS?
> > 
> > The Query ARS Capabilities DSM has a bit that tells the OS whether
> > the platform supports the notification and the point of the
> > notification was to tell the OS it could do a Start ARS with bit 1
> > set.ÂÂOf course, if you get the notification then that means the
> > platform has the capability to deliver it, but it might not hurt to
> > check the flag from the Query Capabilities bit.
> 
> Good point, yes, I think it is safe to assume that a BIOS that claims
> to support un-correctable error notification also supports this Start
> ARS flag.

Yes, ACPI 6.2, section 9.20.7.2, defines that:

ÂÂÂÂÂÂUpon receiving the notification, the OSPM may decide to issue
ÂÂÂÂÂÂa Start ARS with Flags Bit [1] set to prepare for the retrieval
ÂÂÂÂÂÂof existing records and issue the Query ARS Status function to
ÂÂÂÂÂÂretrieve the records.

So,ÂI believe it is safe to assume that BIOS supporting 0x81 also
supports flags Big [1].  Sorry, this is what I should have said in my
previous email...

Thanks,
-Toshi