1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * This file contains NUMA specific variables and functions which can 7 * be split away from DISCONTIGMEM and are used on NUMA machines with 8 * contiguous memory. 9 * 2002/08/07 Erich Focht <efocht@ess.nec.de> 10 * Populate cpu entries in sysfs for non-numa systems as well 11 * Intel Corporation - Ashok Raj 12 */ 13 14 #include <linux/config.h> 15 #include <linux/cpu.h> 16 #include <linux/kernel.h> 17 #include <linux/mm.h> 18 #include <linux/node.h> 19 #include <linux/init.h> 20 #include <linux/bootmem.h> 21 #include <linux/nodemask.h> 22 #include <asm/mmzone.h> 23 #include <asm/numa.h> 24 #include <asm/cpu.h> 25 26 #ifdef CONFIG_NUMA 27 static struct node *sysfs_nodes; 28 #endif 29 static struct ia64_cpu *sysfs_cpus; 30 31 int arch_register_cpu(int num) 32 { 33 struct node *parent = NULL; 34 35 #ifdef CONFIG_NUMA 36 parent = &sysfs_nodes[cpu_to_node(num)]; 37 #endif /* CONFIG_NUMA */ 38 39 return register_cpu(&sysfs_cpus[num].cpu, num, parent); 40 } 41 42 #ifdef CONFIG_HOTPLUG_CPU 43 44 void arch_unregister_cpu(int num) 45 { 46 struct node *parent = NULL; 47 48 #ifdef CONFIG_NUMA 49 int node = cpu_to_node(num); 50 parent = &sysfs_nodes[node]; 51 #endif /* CONFIG_NUMA */ 52 53 return unregister_cpu(&sysfs_cpus[num].cpu, parent); 54 } 55 EXPORT_SYMBOL(arch_register_cpu); 56 EXPORT_SYMBOL(arch_unregister_cpu); 57 #endif /*CONFIG_HOTPLUG_CPU*/ 58 59 60 static int __init topology_init(void) 61 { 62 int i, err = 0; 63 64 #ifdef CONFIG_NUMA 65 sysfs_nodes = kmalloc(sizeof(struct node) * MAX_NUMNODES, GFP_KERNEL); 66 if (!sysfs_nodes) { 67 err = -ENOMEM; 68 goto out; 69 } 70 memset(sysfs_nodes, 0, sizeof(struct node) * MAX_NUMNODES); 71 72 /* MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes? */ 73 for_each_online_node(i) 74 if ((err = register_node(&sysfs_nodes[i], i, 0))) 75 goto out; 76 #endif 77 78 sysfs_cpus = kmalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL); 79 if (!sysfs_cpus) { 80 err = -ENOMEM; 81 goto out; 82 } 83 memset(sysfs_cpus, 0, sizeof(struct ia64_cpu) * NR_CPUS); 84 85 for_each_present_cpu(i) 86 if((err = arch_register_cpu(i))) 87 goto out; 88 out: 89 return err; 90 } 91 92 __initcall(topology_init); 93