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Subject[PATCH v9 01/60] PCI: Add pci_find_root_bus_resource()
Date
Add pci_find_root_bus_resource() to return root bus res
for 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.

Convert old pci_find_parent_resource() to pci_find_bus_resource(),
and reuse it in pci_find_root_bus_resource().
So we avoid changing pcibios_bus_to_resource().

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
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 314db8c..c8cae87 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 6ae25aa..8b3896b 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


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