| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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); |