On Tue, May 16, 2017 at 07:02:00PM +0100, Lorenzo Pieralisi wrote:
> On Tue, May 16, 2017 at 05:15:29PM +0200, Robert Richter wrote:
> > On 15.05.17 14:22:05, Lorenzo Pieralisi wrote:
> > > The introduction of pci_bus_find_numa_node(pci_bus) allows at PCI
> > > host bridge registration to detect the NUMA node for a given
> > > struct pci_bus.dev. Implement an ACPI method that, through
> > > the struct pci_bus.bridge ACPI companion, retrieve and return
> > > the NUMA node corresponding to a given struct pci_bus.dev.
> > >
> > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> > > Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> > > ---
> > > drivers/pci/pci-acpi.c | 20 ++++++++++++++++++++
> > > drivers/pci/pci.c | 2 +-
> > > include/linux/pci.h | 6 ++++++
> > > 3 files changed, 27 insertions(+), 1 deletion(-)
> > >
> >
> > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > > index e9803c1..451342d 100644
> > > --- a/drivers/pci/pci.c
> > > +++ b/drivers/pci/pci.c
> > > @@ -5406,7 +5406,7 @@ int pci_bus_find_domain_nr(struct pci_bus *bus, struct device *parent)
> > >
> > > int pci_bus_find_numa_node(struct pci_bus *bus)
> > > {
> > > - return NUMA_NO_NODE;
> > > + return acpi_disabled ? NUMA_NO_NODE : acpi_pci_bus_find_numa_node(bus);
> >
> > I looked into how this works with devicetree.
> >
> > With ACPI it is set directly in pci_register_host_bridge() with
> > set_dev_node().
> >
> > For the DT case the set_dev_node call sets it to NUMA_NO_NODE first.
> > Since in DT the bridge is a platform device which has the node id
> > assigned already (if there is one), the bus' node id is set later in
> > device_add() when deriving it from the parent device which is the
> > bridge. So this should work.
>
> Which also means that the node propagation for bus->dev in patch 2 can
> be probably removed :), the problem with ACPI is setting the node
> for the host bridge which in DT is done by default at platform device
> creation, the rest is done by the core already there is not any need
> to propagate it again when child busses are created (they take their
> node from the parent).
More explicitly, I think the whole series should work also with the diff
below applied on top of it. Side note: for consistency, I do not think
that adding a DT counterpart to pci_bus_find_numa_node() would hurt.
Thanks !
Lorenzo
-- >8 --
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 76c089f..cf0692c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -862,7 +862,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
*/
child->dev.class = &pcibus_class;
dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
- set_dev_node(&child->dev, dev_to_node(&parent->dev));
+
/*
* Set up the primary, secondary and subordinate
* bus numbers.
--
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