linux-kernel - Re: [PATCH] acpi/hmat: ACPI_HMAT_MEMORY_PD

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Date:   Tue, 3 Sep 2019 11:03:45 +1000
From:   Daniel Black <daniel@...ux.ibm.com>
To:     Keith Busch <keith.busch@...el.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Tao Xu <tao3.xu@...el.com>
Subject: Re: [PATCH] acpi/hmat: ACPI_HMAT_MEMORY_PD_VALID is deprecated in
 ACPI-6.3

On Mon, 2 Sep 2019 23:28:50 +0200
"Rafael J. Wysocki" <rafael@...nel.org> wrote:

> On Tue, Aug 6, 2019 at 6:24 AM Daniel Black <daniel@...ux.ibm.com> wrote:
> >
> > ACPI-6.3 corresponds to when hmat revision was bumped from
> > 1 to 2. In this version ACPI_HMAT_MEMORY_PD_VALID was
> > deprecated and made reserved.
> >
> > As such in revision 2+ we shouldn't be testing this flag.
> >
> > This is as per ACPI-6.3, 5.2.27.3, Table 5-145
> > "Memory Proximity Domain Attributes Structure"
> > for Flags.
> >
> > Signed-off-by: Daniel Black <daniel@...ux.ibm.com>  
> 
> Keith, any comments?

FYI this was found when I was testing Tao Xu's qemu implementation of HMAT ACPI-6.3 which has no implementation of  ACPI_HMAT_MEMORY_PD_VALID.

Current patch implementing Memory Proximity Domain Attributes Structure:
https://patchwork.kernel.org/patch/11125301/