linux-kernel - Re: [PATCH 1/5] ACPI: NUMA: Add 'nohmat' option

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Message-ID: <CAJZ5v0heWeS1iZqHEZ5RB2a=UJbUQF0zAjeFfTa9qBxvQ193=w@mail.gmail.com>
Date:   Wed, 18 Mar 2020 09:24:00 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] ACPI: NUMA: Add 'nohmat' option

On Wed, Mar 18, 2020 at 1:09 AM Dan Williams <dan.j.williams@...el.com> wrote:
>
> On Mon, Mar 2, 2020 at 2:36 PM Dan Williams <dan.j.williams@...el.com> wrote:
> >
> > Disable parsing of the HMAT for debug, to workaround broken platform
> > instances, or cases where it is otherwise not wanted.
>
> Rafael, any heartburn with this change to the numa= option?
>
> ...as I look at this I realize I failed to also update
> Documentation/x86/x86_64/boot-options.rst, will fix.

Thanks!

Apart from this just a minor nit below.

> >
> > Cc: x86@...nel.org
> > Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> > Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> > Cc: Andy Lutomirski <luto@...nel.org>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Borislav Petkov <bp@...en8.de>
> > Cc: "H. Peter Anvin" <hpa@...or.com>
> > Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> > ---
> >  arch/x86/mm/numa.c       |    4 ++++
> >  drivers/acpi/numa/hmat.c |    3 ++-
> >  include/acpi/acpi_numa.h |    1 +
> >  3 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> > index 59ba008504dc..22de2e2610c1 100644
> > --- a/arch/x86/mm/numa.c
> > +++ b/arch/x86/mm/numa.c
> > @@ -44,6 +44,10 @@ static __init int numa_setup(char *opt)
> >  #ifdef CONFIG_ACPI_NUMA
> >         if (!strncmp(opt, "noacpi", 6))
> >                 acpi_numa = -1;
> > +#ifdef CONFIG_ACPI_HMAT
> > +       if (!strncmp(opt, "nohmat", 6))
> > +               hmat_disable = 1;
> > +#endif

I wonder if IS_ENABLED() would work here?

> >  #endif
> >         return 0;
> >  }
> > diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
> > index 2c32cfb72370..d3db121e393a 100644
> > --- a/drivers/acpi/numa/hmat.c
> > +++ b/drivers/acpi/numa/hmat.c
> > @@ -26,6 +26,7 @@
> >  #include <linux/sysfs.h>
> >
> >  static u8 hmat_revision;
> > +int hmat_disable __initdata;
> >
> >  static LIST_HEAD(targets);
> >  static LIST_HEAD(initiators);
> > @@ -814,7 +815,7 @@ static __init int hmat_init(void)
> >         enum acpi_hmat_type i;
> >         acpi_status status;
> >
> > -       if (srat_disabled())
> > +       if (srat_disabled() || hmat_disable)
> >                 return 0;
> >
> >         status = acpi_get_table(ACPI_SIG_SRAT, 0, &tbl);
> > diff --git a/include/acpi/acpi_numa.h b/include/acpi/acpi_numa.h
> > index fdebcfc6c8df..48ca468e9b61 100644
> > --- a/include/acpi/acpi_numa.h
> > +++ b/include/acpi/acpi_numa.h
> > @@ -18,6 +18,7 @@ extern int node_to_pxm(int);
> >  extern int acpi_map_pxm_to_node(int);
> >  extern unsigned char acpi_srat_revision;
> >  extern int acpi_numa __initdata;
> > +extern int hmat_disable __initdata;
> >
> >  extern void bad_srat(void);
> >  extern int srat_disabled(void);
> >