linux-kernel - Re: [PATCH v3 2/3] libnvdimm: Set numa

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Date:	Wed, 24 Jun 2015 11:05:32 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] libnvdimm: Set numa_node to NVDIMM devices

On Wed, 2015-06-24 at 09:50 -0700, Dan Williams wrote:
> On Fri, Jun 19, 2015 at 11:18 AM, Toshi Kani <toshi.kani@...com> wrote:
> > ACPI NFIT table has System Physical Address Range Structure
> > entries that describe a proximity ID of each range when
> > ACPI_NFIT_PROXIMITY_VALID is set in the flags.
> >
> > Change acpi_nfit_register_region() to map a proximity ID to its
> > node ID, and set it to a new numa_node field of nd_region_desc,
> > which is then conveyed to nd_region.
> >
> > nd_region_probe() and nd_btt_probe() set the numa_node of nd_region
> > to their device object being probed.  A namespace device inherits
> > the numa_node from the parent region device.
> >
> > Signed-off-by: Toshi Kani <toshi.kani@...com>
> > ---
> >  drivers/acpi/nfit.c          |    6 ++++++
> >  drivers/nvdimm/btt.c         |    2 ++
> >  drivers/nvdimm/nd.h          |    1 +
> >  drivers/nvdimm/region.c      |    1 +
> >  drivers/nvdimm/region_devs.c |    1 +
> >  include/linux/libnvdimm.h    |    1 +
> >  6 files changed, 12 insertions(+)
> >
> > diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
> > index 5f64582..5997753 100644
> > --- a/drivers/acpi/nfit.c
> > +++ b/drivers/acpi/nfit.c
> > @@ -1392,6 +1392,12 @@ 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);
> > +       else
> > +               ndr_desc->numa_node = NUMA_NO_NODE;
> > +
> >         list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) {
> >                 struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev;
> >                 struct nd_mapping *nd_mapping;
> > diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
> > index 57d3b27..ab082e5 100644
> > --- a/drivers/nvdimm/btt.c
> > +++ b/drivers/nvdimm/btt.c
> > @@ -1495,6 +1495,8 @@ static int nd_btt_probe(struct device *dev)
> >                 rc = -ENOMEM;
> >                 goto err_btt;
> >         }
> > +
> > +       set_dev_node(dev, nd_region->numa_node);
> >         dev_set_drvdata(dev, btt);
> >
> >         return 0;
> > diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> > index 011d7c5..0bfd20a 100644
> > --- a/drivers/nvdimm/nd.h
> > +++ b/drivers/nvdimm/nd.h
> > @@ -93,6 +93,7 @@ struct nd_region {
> >         u64 ndr_size;
> >         u64 ndr_start;
> >         int id, num_lanes;
> > +       int numa_node;
> >         void *provider_data;
> >         struct nd_interleave_set *nd_set;
> >         struct nd_mapping mapping[0];
> > diff --git a/drivers/nvdimm/region.c b/drivers/nvdimm/region.c
> > index d9d82e7..a764ca6 100644
> > --- a/drivers/nvdimm/region.c
> > +++ b/drivers/nvdimm/region.c
> > @@ -123,6 +123,7 @@ static int nd_region_probe(struct device *dev)
> >
> >         num_ns->active = rc;
> >         num_ns->count = rc + err;
> > +       set_dev_node(dev, nd_region->numa_node);
> >         dev_set_drvdata(dev, num_ns);
> >
> >         if (err == 0)
> > diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
> > index bb9f329..703dfae 100644
> > --- a/drivers/nvdimm/region_devs.c
> > +++ b/drivers/nvdimm/region_devs.c
> > @@ -632,6 +632,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
> >         nd_region->provider_data = ndr_desc->provider_data;
> >         nd_region->nd_set = ndr_desc->nd_set;
> >         nd_region->num_lanes = ndr_desc->num_lanes;
> > +       nd_region->numa_node = ndr_desc->numa_node;
> 
> Why introduce nd_region->numa_node?  Why not do set_dev_node() directly here?
> 
> I can make this change locally if you agree, we don't need to wait
> until probe to set these.

dev->numa_node cannot be set here because nd_region_create() then calls
nd_device_register() -> device_initialize() -> set_dev_node(dev, -1).
So, it gets overwritten with -1.

Thanks,
-Toshi 



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