Subject: powerpc: Allow devices to register with numa topology
From: Jeremy Kerr <jk@ozlabs.org>

Change of_node_to_nid() to traverse the device tree, looking for a numa
id. Cell uses this to assign ids to SPUs, which are children of the CPU
node. Existing users of of_node_to_nid() are altered to use
of_node_to_nid_single(), which doesn't do the traversal.

Export an attach_sysdev_to_node() function, allowing system devices (eg.
SPUs) to link themselves into the numa topology in sysfs.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

---

Index: linus-2.6/arch/powerpc/mm/numa.c
===================================================================
--- linus-2.6.orig/arch/powerpc/mm/numa.c
+++ linus-2.6/arch/powerpc/mm/numa.c
@@ -208,6 +208,28 @@ static int of_node_numa_domain(struct de
 	return numa_domain;
 }
 
+/* Walk the device tree upwards, looking for an associativity id */
+int of_node_to_nid(struct device_node *device)
+{
+	struct device_node *tmp;
+	int nid = -1;
+
+	of_node_get(device);
+	while (device) {
+		nid = of_node_numa_domain(device);
+		if (nid != -1)
+			break;
+
+	        tmp = device;
+		device = of_get_parent(tmp);
+		of_node_put(tmp);
+	}
+	of_node_put(device);
+
+	return nid;
+}
+EXPORT_SYMBOL_GPL(of_node_to_nid);
+
 /*
  * In theory, the "ibm,associativity" property may contain multiple
  * associativity lists because a resource may be multiply connected
Index: linus-2.6/include/asm-powerpc/topology.h
===================================================================
--- linus-2.6.orig/include/asm-powerpc/topology.h
+++ linus-2.6/include/asm-powerpc/topology.h
@@ -4,6 +4,9 @@
 
 #include <linux/config.h>
 
+struct sys_device;
+struct device_node;
+
 #ifdef CONFIG_NUMA
 
 #include <asm/mmzone.h>
@@ -27,6 +30,8 @@ static inline int node_to_first_cpu(int 
 	return first_cpu(tmp);
 }
 
+int of_node_to_nid(struct device_node *device);
+
 #define pcibus_to_node(node)    (-1)
 #define pcibus_to_cpumask(bus)	(cpu_online_map)
 
@@ -57,10 +62,29 @@ static inline int node_to_first_cpu(int 
 
 extern void __init dump_numa_cpu_topology(void);
 
+extern int sysfs_add_device_to_node(struct sys_device *dev, int nid);
+extern void sysfs_remove_device_from_node(struct sys_device *dev, int nid);
+
 #else
 
+static inline int of_node_to_nid(struct device_node *device)
+{
+	return 0;
+}
+
 static inline void dump_numa_cpu_topology(void) {}
 
+static inline int sysfs_add_device_to_node(struct sys_device *dev, int nid)
+{
+	return 0;
+}
+
+static inline void sysfs_remove_device_from_node(struct sys_device *dev,
+						int nid)
+{
+}
+
+
 #include <asm-generic/topology.h>
 
 #endif /* CONFIG_NUMA */
Index: linus-2.6/arch/powerpc/kernel/sysfs.c
===================================================================
--- linus-2.6.orig/arch/powerpc/kernel/sysfs.c
+++ linus-2.6/arch/powerpc/kernel/sysfs.c
@@ -322,13 +322,31 @@ static void register_nodes(void)
 		}
 	}
 }
+
+int sysfs_add_device_to_node(struct sys_device *dev, int nid)
+{
+	struct node *node = &node_devices[nid];
+	return sysfs_create_link(&node->sysdev.kobj, &dev->kobj,
+			kobject_name(&dev->kobj));
+}
+
+void sysfs_remove_device_from_node(struct sys_device *dev, int nid)
+{
+	struct node *node = &node_devices[nid];
+	sysfs_remove_link(&node->sysdev.kobj, kobject_name(&dev->kobj));
+}
+
 #else
 static void register_nodes(void)
 {
 	return;
 }
+
 #endif
 
+EXPORT_SYMBOL_GPL(sysfs_add_device_to_node);
+EXPORT_SYMBOL_GPL(sysfs_remove_device_from_node);
+
 /* Only valid if CPU is present. */
 static ssize_t show_physical_id(struct sys_device *dev, char *buf)
 {