On Mon, Sep 08, 2014 at 02:54:28PM +0100, Liviu Dudau wrote:

The handling of PCI domains (or PCI segments in ACPI speak) is
usually a straightforward affair but its implementation is
currently left to the architectural code, with pci_domain_nr(b)
querying the value of the domain associated with bus b.

This patch introduces CONFIG_PCI_DOMAINS_GENERIC as an
option that can be selected if an architecture want a
simple implementation where the value of the domain
associated with a bus is stored in struct pci_bus.

The architectures that select CONFIG_PCI_DOMAINS_GENERIC will
then have to implement pci_bus_assign_domain_nr() as a way
of setting the domain number associated with a root bus.
All child busses except the root bus will inherit the domain_nr
value from their parent.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Catalin Marinas <Catalin.Marinas@arm.com>
[Renamed pci_set_domain_nr() to pci_bus_assign_domain_nr()]
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>

I'm probably the author here, but the patch log doesn't say so (I don't
mind, just a remark).

-- 
Catalin