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

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Date:   Thu, 8 Jun 2017 10:34:22 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Linda Knippers <linda.knippers@....com>
Cc:     "Kani, Toshimitsu" <toshi.kani@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>
Subject: Re: [PATCH] Add support of NVDIMM memory error notification in ACPI 6.2

On Thu, Jun 8, 2017 at 10:30 AM, Linda Knippers <linda.knippers@....com> 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.