On Wed, Feb 24, 2016 at 06:11:52PM -0800, Yinghai Lu wrote:
> Add pci_find_root_bus_resource() to return root bus resource
> for input resource.
>
> For sparc mem64 support, We need that host bridge window res:
> 1. we need direct parent for request_resource_conflict() calling in
> pci_register_legacy_regions().
> 2. check if return is NULL to decide if region is valid or not.
Whenever somebody proposes a new interface that's only required for
one architecture, the obvious question is "what is unique about that
architecture that makes the new interface necessary?"
Neither this patch nor the follow-on patch that adds the use of
pci_find_root_bus_resource() answers that question.
> Convert old pci_find_parent_resource() to pci_find_bus_resource(),
> and use it in pci_find_root_bus_resource() and new
> pci_find_parent_resource().
>
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> ---
> drivers/pci/pci.c | 36 +++++++++++++++++++++++++-----------
> include/linux/pci.h | 2 ++
> 2 files changed, 27 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 602eb42..db4025f 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -415,18 +415,9 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
> }
> EXPORT_SYMBOL_GPL(pci_find_ht_capability);
>
> -/**
> - * pci_find_parent_resource - return resource region of parent bus of given region
> - * @dev: PCI device structure contains resources to be searched
> - * @res: child resource record for which parent is sought
> - *
> - * For given resource region of given device, return the resource
> - * region of parent bus the given region is contained in.
> - */
> -struct resource *pci_find_parent_resource(const struct pci_dev *dev,
> - struct resource *res)
> +static struct resource *pci_find_bus_resource(const struct pci_bus *bus,
> + struct resource *res)
> {
> - const struct pci_bus *bus = dev->bus;
> struct resource *r;
> int i;
>
> @@ -456,8 +447,31 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
> }
> return NULL;
> }
> +
> +/**
> + * pci_find_parent_resource - return resource region of parent bus of given region
> + * @dev: PCI device structure contains resources to be searched
> + * @res: child resource record for which parent is sought
> + *
> + * For given resource region of given device, return the resource
> + * region of parent bus the given region is contained in.
> + */
> +struct resource *pci_find_parent_resource(const struct pci_dev *dev,
> + struct resource *res)
> +{
> + return pci_find_bus_resource(dev->bus, res);
> +}
> EXPORT_SYMBOL(pci_find_parent_resource);
>
> +struct resource *pci_find_root_bus_resource(struct pci_bus *bus,
> + struct resource *res)
> +{
> + while (bus->parent)
> + bus = bus->parent;
> +
> + return pci_find_bus_resource(bus, res);
> +}
> +
> /**
> * pci_find_pcie_root_port - return PCIe Root Port
> * @dev: PCI device to query
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 27df4a6..dd603a668 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -792,6 +792,8 @@ void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
> struct resource *res);
> void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
> struct pci_bus_region *region);
> +struct resource *pci_find_root_bus_resource(struct pci_bus *bus,
> + struct resource *res);
> void pcibios_scan_specific_bus(int busn);
> struct pci_bus *pci_find_bus(int domain, int busnr);
> void pci_bus_add_devices(const struct pci_bus *bus);
> --
> 1.8.4.5
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
