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

["Kani, Toshimitsu" <toshi.kani@hpe.com>]

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@hpe.c
> 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.  Of 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:

      Upon receiving the notification, the OSPM may decide to issue
      a Start ARS with Flags Bit [1] set to prepare for the retrieval
      of existing records and issue the Query ARS Status function to
      retrieve the records.

So, I 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