linux-kernel - Re: [PATCH v2] device-dax: use fallback nid when numa node is invalid

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Date:   Wed, 15 Sep 2021 09:22:39 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Justin He <Justin.He@....com>
Cc:     Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Linux NVDIMM <nvdimm@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH v2] device-dax: use fallback nid when numa node is invalid

On Tue, Sep 14, 2021 at 11:51 PM Justin He <Justin.He@....com> wrote:
[..]
> > > diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> > > index fb775b967c52..d3a0cec635b1 100644
> > > --- a/drivers/acpi/nfit/core.c
> > > +++ b/drivers/acpi/nfit/core.c
> > > @@ -3005,15 +3005,8 @@ static int acpi_nfit_register_region(struct
> > > acpi_nfit_desc *acpi_desc,
> > >         ndr_desc->res = &res;
> > >         ndr_desc->provider_data = nfit_spa;
> > >         ndr_desc->attr_groups = acpi_nfit_region_attribute_groups;
> > > -       if (spa->flags & ACPI_NFIT_PROXIMITY_VALID) {
> > > -               ndr_desc->numa_node = acpi_map_pxm_to_online_node(
> > > -                                               spa->proximity_domain);
> > > -               ndr_desc->target_node = acpi_map_pxm_to_node(
> > > -                               spa->proximity_domain);
> > > -       } else {
> > > -               ndr_desc->numa_node = NUMA_NO_NODE;
> > > -               ndr_desc->target_node = NUMA_NO_NODE;
> > > -       }
> > > +       ndr_desc->numa_node = memory_add_physaddr_to_nid(spa->address);
> > > +       ndr_desc->target_node = phys_to_target_node(spa->address);
> > >
> > >         /*
> > >          * Persistence domain bits are hierarchical, if
> > > ===================================================
> > >
> > > Do you still suggest fixing like this?
> >
> > Are you saying that ACPI_NFIT_PROXIMITY_VALID is not set on your
> > platform, or that pxm_to_node() returns NUMA_NO_NODE?
> >
> Latter,  ACPI_NFIT_PROXIMITY_VALID is *set* in my case.
>
> > I would expect something like this:
> >
> > diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> > index a3ef6cce644c..95de7dc18ed8 100644
> > --- a/drivers/acpi/nfit/core.c
> > +++ b/drivers/acpi/nfit/core.c
> > @@ -3007,6 +3007,15 @@ static int acpi_nfit_register_region(struct
> > acpi_nfit_desc *acpi_desc,
> >                 ndr_desc->target_node = NUMA_NO_NODE;
> >         }
> >
> > +       /*
> > +        * Fallback to address based numa information if node lookup
> > +        * failed
> > +        */
> > +       if (ndr_desc->numa_node == NUMA_NO_NODE)
> > +               ndr_desc->numa_node = memory_add_physaddr_to_nid(spa-
> > >address);
> > +       if (ndr_desc->target_node == NUMA_NO_NODE)
> > +               phys_to_target_node(spa->address);
> > +
>
> Would it better to add a dev_info() here to report this node id changing?

Yes, given all the possibilities here, a dev_info() reporting the
final result of the node mapping is justifiable.