[POWERPC] pcibus_to_node fixes

of_node_to_nid returns -1 if the associativity cannot be found. This
means pcibus_to_cpumask has to be careful not to pass a negative index into
node_to_cpumask.

Since pcibus_to_node could be used a lot, and of_node_to_nid is slow (it
walks a list doing strcmps), lets also cache the node in the
pci_controller struct.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/pci_64.c

@@ -227,8 +227,10 @@ struct pci_controller * pcibios_alloc_controller(struct device_node *dev)
 	pci_setup_pci_controller(phb);
 	phb->arch_data = dev;
 	phb->is_dynamic = mem_init_done;
-	if (dev)
+	if (dev) {
+		PHB_SET_NODE(phb, of_node_to_nid(dev));
 		add_linux_pci_domain(dev, phb);
+	}
 	return phb;
 }
 
@@ -1415,3 +1417,12 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
 
 	return -EOPNOTSUPP;
 }
+
+#ifdef CONFIG_NUMA
+int pcibus_to_node(struct pci_bus *bus)
+{
+	struct pci_controller *phb = pci_bus_to_host(bus);
+	return phb->node;
+}
+EXPORT_SYMBOL(pcibus_to_node);
+#endif

include/asm-powerpc/pci-bridge.h

@@ -6,6 +6,7 @@
 #include <asm-ppc/pci-bridge.h>
 #else
 
+#include <linux/config.h>
 #include <linux/pci.h>
 #include <linux/list.h>
 
@@ -22,6 +23,7 @@
 struct pci_controller {
 	struct pci_bus *bus;
 	char is_dynamic;
+	int node;
 	void *arch_data;
 	struct list_head list_node;
 
@@ -165,6 +167,12 @@ static inline unsigned long pci_address_to_pio(phys_addr_t address)
 #define PCI_PROBE_NORMAL	0	/* Do normal PCI probing */
 #define PCI_PROBE_DEVTREE	1	/* Instantiate from device tree */
 
+#ifdef CONFIG_NUMA
+#define PHB_SET_NODE(PHB, NODE)		((PHB)->node = (NODE))
+#else
+#define PHB_SET_NODE(PHB, NODE)		((PHB)->node = -1)
+#endif
+
 #endif /* CONFIG_PPC64 */
 #endif /* __KERNEL__ */
 #endif

include/asm-powerpc/topology.h

@@ -32,13 +32,13 @@ static inline int node_to_first_cpu(int node)
 
 int of_node_to_nid(struct device_node *device);
 
-#ifdef CONFIG_PPC64
-#define pcibus_to_node(bus)	(of_node_to_nid(bus->sysdata))
-#define pcibus_to_cpumask(bus)	(node_to_cpumask(of_node_to_nid(bus->sysdata)))
-#else
-#define pcibus_to_node(node)    (-1)
-#define pcibus_to_cpumask(bus)	(cpu_online_map)
-#endif
+struct pci_bus;
+extern int pcibus_to_node(struct pci_bus *bus);
+
+#define pcibus_to_cpumask(bus)	(pcibus_to_node(bus) == -1 ? \
+					CPU_MASK_ALL : \
+					node_to_cpumask(pcibus_to_node(bus)) \
+				)
 
 /* sched_domains SD_NODE_INIT for PPC64 machines */
 #define SD_NODE_INIT (struct sched_domain) {		\