arch/ia64/kernel/topology.c

   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);