[PATCH v6 30/42] powerpc/pci: Move pcibios_find_pci_bus() around

[Gavin Shan]

This moves pcibios_find_pci_bus() to PowerPC kernel directory
so that it can be reused by hotplug code for pSeries and PowerNV
platform at the same time. Also, the function is renamed to
of_node_to_pci_bus().

Signed-off-by: Gavin Shan <gwshan at linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 arch/powerpc/include/asm/pci-bridge.h      |  2 +-
 arch/powerpc/kernel/pci-hotplug.c          | 30 ++++++++++++++++++++++++++++
 arch/powerpc/platforms/pseries/pci_dlpar.c | 32 ------------------------------
 drivers/pci/hotplug/rpadlpar_core.c        |  6 +++---
 drivers/pci/hotplug/rpaphp_pci.c           |  2 +-
 5 files changed, 35 insertions(+), 37 deletions(-)

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index 65357a9..84dee1e 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -259,7 +259,7 @@ static inline struct eeh_dev *pdn_to_eeh_dev(struct pci_dn *pdn)
 #endif
 
 /** Find the bus corresponding to the indicated device node */
-extern struct pci_bus *pcibios_find_pci_bus(struct device_node *dn);
+extern struct pci_bus *of_node_to_pci_bus(struct device_node *dn);
 
 /** Remove all of the PCI devices under this bus */
 extern void pcibios_remove_pci_devices(struct pci_bus *bus);
diff --git a/arch/powerpc/kernel/pci-hotplug.c b/arch/powerpc/kernel/pci-hotplug.c
index c307d9a..692beca 100644
--- a/arch/powerpc/kernel/pci-hotplug.c
+++ b/arch/powerpc/kernel/pci-hotplug.c
@@ -21,6 +21,36 @@
 #include <asm/firmware.h>
 #include <asm/eeh.h>
 
+static struct pci_bus *find_pci_bus(struct pci_bus *bus,
+				    struct device_node *dn)
+{
+	struct pci_bus *tmp, *child = NULL;
+	struct device_node *busdn;
+
+	busdn = pci_bus_to_OF_node(bus);
+	if (busdn == dn)
+		return bus;
+
+	list_for_each_entry(tmp, &bus->children, node) {
+		child = find_pci_bus(tmp, dn);
+		if (child)
+			break;
+	}
+
+	return child;
+}
+
+struct pci_bus *of_node_to_pci_bus(struct device_node *dn)
+{
+	struct pci_dn *pdn = dn->data;
+
+	if (!pdn  || !pdn->phb || !pdn->phb->bus)
+		return NULL;
+
+	return find_pci_bus(pdn->phb->bus, dn);
+}
+EXPORT_SYMBOL_GPL(of_node_to_pci_bus);
+
 /**
  * pcibios_release_device - release PCI device
  * @dev: PCI device
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c
index 5d4a3df..906dbaa 100644
--- a/arch/powerpc/platforms/pseries/pci_dlpar.c
+++ b/arch/powerpc/platforms/pseries/pci_dlpar.c
@@ -34,38 +34,6 @@
 
 #include "pseries.h"
 
-static struct pci_bus *
-find_bus_among_children(struct pci_bus *bus,
-                        struct device_node *dn)
-{
-	struct pci_bus *child = NULL;
-	struct pci_bus *tmp;
-	struct device_node *busdn;
-
-	busdn = pci_bus_to_OF_node(bus);
-	if (busdn == dn)
-		return bus;
-
-	list_for_each_entry(tmp, &bus->children, node) {
-		child = find_bus_among_children(tmp, dn);
-		if (child)
-			break;
-	};
-	return child;
-}
-
-struct pci_bus *
-pcibios_find_pci_bus(struct device_node *dn)
-{
-	struct pci_dn *pdn = dn->data;
-
-	if (!pdn  || !pdn->phb || !pdn->phb->bus)
-		return NULL;
-
-	return find_bus_among_children(pdn->phb->bus, dn);
-}
-EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
-
 struct pci_controller *init_phb_dynamic(struct device_node *dn)
 {
 	struct pci_controller *phb;
diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
index e12bafd..f57a293 100644
--- a/drivers/pci/hotplug/rpadlpar_core.c
+++ b/drivers/pci/hotplug/rpadlpar_core.c
@@ -176,7 +176,7 @@ static int dlpar_add_pci_slot(char *drc_name, struct device_node *dn)
 	struct pci_dev *dev;
 	struct pci_controller *phb;
 
-	if (pcibios_find_pci_bus(dn))
+	if (of_node_to_pci_bus(dn))
 		return -EINVAL;
 
 	/* Add pci bus */
@@ -213,7 +213,7 @@ static int dlpar_remove_phb(char *drc_name, struct device_node *dn)
 	struct pci_dn *pdn;
 	int rc = 0;
 
-	if (!pcibios_find_pci_bus(dn))
+	if (!of_node_to_pci_bus(dn))
 		return -EINVAL;
 
 	/* If pci slot is hotpluggable, use hotplug to remove it */
@@ -357,7 +357,7 @@ int dlpar_remove_pci_slot(char *drc_name, struct device_node *dn)
 
 	pci_lock_rescan_remove();
 
-	bus = pcibios_find_pci_bus(dn);
+	bus = of_node_to_pci_bus(dn);
 	if (!bus) {
 		ret = -EINVAL;
 		goto out;
diff --git a/drivers/pci/hotplug/rpaphp_pci.c b/drivers/pci/hotplug/rpaphp_pci.c
index 9243f3e7..293bd86 100644
--- a/drivers/pci/hotplug/rpaphp_pci.c
+++ b/drivers/pci/hotplug/rpaphp_pci.c
@@ -93,7 +93,7 @@ int rpaphp_enable_slot(struct slot *slot)
 	if (rc)
 		return rc;
 
-	bus = pcibios_find_pci_bus(slot->dn);
+	bus = of_node_to_pci_bus(slot->dn);
 	if (!bus) {
 		err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name);
 		return -EINVAL;
-- 
2.1.0