[PATCH] Update/Create core files for DriverFS Topology.

From Matthew Dobson.

Update/Create core files for DriverFS Topology.

This patch creates the generic structures that are (will be) embedded in
the per-arch structures.  Also creates calls to register these generic
structures (CPUs, MemBlks, & Nodes).

Note that without arch-specific structures in which to embed these
structures, and an arch-specific initialization routine, these
functions/structures remain unused.

arch/i386/kernel/cpu/common.c

 #include <linux/init.h>
 #include <linux/string.h>
 #include <linux/delay.h>
-#include <linux/cpu.h>
 #include <linux/smp.h>
 #include <asm/semaphore.h>
 #include <asm/processor.h>
@@ -507,37 +506,3 @@ void __init cpu_init (void)
 	current->used_math = 0;
 	stts();
 }
-
-/*
- * Bulk registration of the cpu devices with the system.
- * Some of this stuff could possibly be moved into a shared 
- * location..
- * Also, these devices should be integrated with other CPU data..
- */
-
-static struct cpu cpu_devices[NR_CPUS];
-
-static struct device_driver cpu_driver = {
-	.name		= "cpu",
-	.bus		= &system_bus_type,
-	.devclass	= &cpu_devclass,
-};
-
-static int __init register_cpus(void)
-{
-	int i;
-
-	driver_register(&cpu_driver);
-
-	for (i = 0; i < NR_CPUS; i++) {
-		struct sys_device * sysdev = &cpu_devices[i].sysdev;
-		sysdev->name = "cpu";
-		sysdev->id = i;
-		sysdev->dev.driver = &cpu_driver;
-		if (cpu_possible(i))
-			sys_device_register(sysdev);
-	}
-	return 0;
-}
-
-subsys_initcall(register_cpus);

drivers/base/Makefile

@@ -4,12 +4,13 @@ obj-y		:= core.o sys.o interface.o power.o bus.o \
 			driver.o class.o intf.o platform.o \
 			cpu.o firmware.o
 
+obj-$(CONFIG_NUMA)	+= node.o  memblk.o
+
 obj-y		+= fs/
 
 obj-$(CONFIG_HOTPLUG)	+= hotplug.o
 
 export-objs	:= core.o power.o sys.o bus.o driver.o \
-			class.o intf.o platform.o cpu.o  \
-			firmware.o
+			class.o intf.o platform.o firmware.o
 
 include $(TOPDIR)/Rules.make

drivers/base/cpu.c

 /*
- * cpu.c - basic cpu class support
+ * drivers/base/cpu.c - basic CPU class support
  */
 
 #include <linux/device.h>
@@ -7,22 +7,48 @@
 #include <linux/init.h>
 #include <linux/cpu.h>
 
+#include <asm/topology.h>
+
+
 static int cpu_add_device(struct device * dev)
 {
 	return 0;
 }
-
 struct device_class cpu_devclass = {
 	.name		= "cpu",
 	.add_device	= cpu_add_device,
 };
 
 
-static int __init cpu_devclass_init(void)
+struct device_driver cpu_driver = {
+	.name		= "cpu",
+	.bus		= &system_bus_type,
+	.devclass	= &cpu_devclass,
+};
+
+
+/*
+ * register_cpu - Setup a driverfs device for a CPU.
+ * @num - CPU number to use when creating the device.
+ *
+ * Initialize and register the CPU device.
+ */
+void __init register_cpu(struct cpu *cpu, int num, struct node *root)
 {
-	return devclass_register(&cpu_devclass);
+	cpu->node_id = __cpu_to_node(num);
+	cpu->sysdev.name = "cpu";
+	cpu->sysdev.id = num;
+	if (root)
+		cpu->sysdev.root = &root->sysroot;
+	snprintf(cpu->sysdev.dev.name, DEVICE_NAME_SIZE, "CPU %u", num);
+	cpu->sysdev.dev.driver = &cpu_driver;
+	sys_device_register(&cpu->sysdev);
 }
 
-postcore_initcall(cpu_devclass_init);
 
-EXPORT_SYMBOL(cpu_devclass);
+static int __init register_cpu_type(void)
+{
+	driver_register(&cpu_driver);
+	return devclass_register(&cpu_devclass);
+}
+postcore_initcall(register_cpu_type);

drivers/base/memblk.c

+/*
+ * drivers/base/memblk.c - basic Memory Block class support
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/memblk.h>
+#include <linux/node.h>
+
+#include <asm/topology.h>
+
+
+static int memblk_add_device(struct device * dev)
+{
+	return 0;
+}
+struct device_class memblk_devclass = {
+	.name		= "memblk",
+	.add_device	= memblk_add_device,
+};
+
+
+struct device_driver memblk_driver = {
+	.name		= "memblk",
+	.bus		= &system_bus_type,
+	.devclass	= &memblk_devclass,
+};
+
+
+/*
+ * register_memblk - Setup a driverfs device for a MemBlk
+ * @num - MemBlk number to use when creating the device.
+ *
+ * Initialize and register the MemBlk device.
+ */
+void __init register_memblk(struct memblk *memblk, int num, struct node *root)
+{
+	memblk->node_id = __memblk_to_node(num);
+	memblk->sysdev.name = "memblk";
+	memblk->sysdev.id = num;
+	if (root)
+		memblk->sysdev.root = &root->sysroot;
+	snprintf(memblk->sysdev.dev.name, DEVICE_NAME_SIZE, "Memory Block %u", num);
+	memblk->sysdev.dev.driver = &memblk_driver;
+	sys_device_register(&memblk->sysdev);
+}
+
+
+static int __init register_memblk_type(void)
+{
+	driver_register(&memblk_driver);
+	return devclass_register(&memblk_devclass);
+}
+postcore_initcall(register_memblk_type);

drivers/base/node.c

+/*
+ * drivers/base/node.c - basic Node class support
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/node.h>
+
+#include <asm/topology.h>
+
+
+static int node_add_device(struct device * dev)
+{
+	return 0;
+}
+struct device_class node_devclass = {
+	.name		= "node",
+	.add_device	= node_add_device,
+};
+
+
+struct device_driver node_driver = {
+	.name		= "node",
+	.bus		= &system_bus_type,
+	.devclass	= &node_devclass,
+};
+
+
+static ssize_t node_read_cpumap(struct device * dev, char * buf, size_t count, loff_t off)
+{
+	struct node *node_dev = to_node(to_root(dev));
+        return off ? 0 : sprintf(buf,"%lx\n",node_dev->cpumap);
+}
+static DEVICE_ATTR(cpumap,S_IRUGO,node_read_cpumap,NULL);
+
+
+/*
+ * register_node - Setup a driverfs device for a node.
+ * @num - Node number to use when creating the device.
+ *
+ * Initialize and register the node device.
+ */
+void __init register_node(struct node *node, int num, struct node *parent)
+{
+	node->cpumap = __node_to_cpu_mask(num);
+	node->sysroot.id = num;
+	if (parent)
+		node->sysroot.dev.parent = &parent->sysroot.sysdev;
+	snprintf(node->sysroot.dev.name, DEVICE_NAME_SIZE, "Node %u", num);
+	snprintf(node->sysroot.dev.bus_id, BUS_ID_SIZE, "node%u", num);
+	node->sysroot.dev.driver = &node_driver;
+	node->sysroot.dev.bus = &system_bus_type;
+	if (!sys_register_root(&node->sysroot)){
+		device_create_file(&node->sysroot.dev, &dev_attr_cpumap);
+	}
+}
+
+
+static int __init register_node_type(void)
+{
+	driver_register(&node_driver);
+	return devclass_register(&node_devclass);
+}
+postcore_initcall(register_node_type);

drivers/base/sys.c

@@ -55,6 +55,9 @@ int sys_register_root(struct sys_root * root)
 	if (!root)
 		return -EINVAL;
 
+	if (!root->dev.parent)
+		root->dev.parent = &system_bus;
+
 	pr_debug("Registering system board %d\n",root->id);
 
 	error = device_register(&root->dev);

include/linux/cpu.h

 /*
- * cpu.h - generic cpu defition
+ * include/linux/cpu.h - generic cpu definition
  *
  * This is mainly for topological representation. We define the 
  * basic 'struct cpu' here, which can be embedded in per-arch 
@@ -15,14 +15,18 @@
  * See the following for how to do this: 
  * - drivers/base/intf.c 
  * - Documentation/driver-model/interface.txt
- *
  */
+#ifndef _LINUX_CPU_H_
+#define _LINUX_CPU_H_
 
 #include <linux/device.h>
-
-extern struct device_class cpu_devclass;
+#include <linux/node.h>
 
 struct cpu {
+	int node_id;		/* The node which contains the CPU */
 	struct sys_device sysdev;
 };
 
+extern void register_cpu(struct cpu *, int, struct node *);
+
+#endif /* _LINUX_CPU_H_ */

include/linux/memblk.h

+/*
+ * include/linux/memblk.h - generic memblk definition
+ *
+ * This is mainly for topological representation. We define the 
+ * basic 'struct memblk' here, which can be embedded in per-arch 
+ * definitions of memory blocks.
+ *
+ * Basic handling of the devices is done in drivers/base/memblk.c
+ * and system devices are handled in drivers/base/sys.c. 
+ *
+ * MemBlks are exported via driverfs in the class/memblk/devices/
+ * directory. 
+ *
+ * Per-memblk interfaces can be implemented using a struct device_interface. 
+ * See the following for how to do this: 
+ * - drivers/base/intf.c 
+ * - Documentation/driver-model/interface.txt
+ */
+#ifndef _LINUX_MEMBLK_H_
+#define _LINUX_MEMBLK_H_
+
+#include <linux/device.h>
+#include <linux/node.h>
+
+struct memblk {
+	int node_id;		/* The node which contains the MemBlk */
+	struct sys_device sysdev;
+};
+
+extern void register_memblk(struct memblk *, int, struct node *);
+
+#endif /* _LINUX_MEMBLK_H_ */

include/linux/node.h

+/*
+ * include/linux/node.h - generic node definition
+ *
+ * This is mainly for topological representation. We define the 
+ * basic 'struct node' here, which can be embedded in per-arch 
+ * definitions of processors.
+ *
+ * Basic handling of the devices is done in drivers/base/node.c
+ * and system devices are handled in drivers/base/sys.c. 
+ *
+ * Nodes are exported via driverfs in the class/node/devices/
+ * directory. 
+ *
+ * Per-node interfaces can be implemented using a struct device_interface. 
+ * See the following for how to do this: 
+ * - drivers/base/intf.c 
+ * - Documentation/driver-model/interface.txt
+ */
+#ifndef _LINUX_NODE_H_
+#define _LINUX_NODE_H_
+
+#include <linux/device.h>
+
+struct node {
+	unsigned long cpumap;	/* Bitmap of CPUs on the Node */
+	struct sys_root sysroot;
+};
+
+extern void register_node(struct node *, int, struct node *);
+
+#define to_node(_root) container_of(_root, struct node, sysroot)
+#define to_root(_dev) container_of(_dev, struct sys_root, dev)
+
+#endif /* _LINUX_NODE_H_ */