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 #ifdef CONFIG_ACPI
  40         /*
  41          * If CPEI cannot be re-targetted, and this is
  42          * CPEI target, then dont create the control file
  43          */
  44         if (!can_cpei_retarget() && is_cpu_cpei_target(num))
  45                 sysfs_cpus[num].cpu.no_control = 1;
  46 #endif
  47
  48         return register_cpu(&sysfs_cpus[num].cpu, num, parent);
  49 }
  50
  51 #ifdef CONFIG_HOTPLUG_CPU
  52
  53 void arch_unregister_cpu(int num)
  54 {
  55         struct node *parent = NULL;
  56
  57 #ifdef CONFIG_NUMA
  58         int node = cpu_to_node(num);
  59         parent = &sysfs_nodes[node];
  60 #endif /* CONFIG_NUMA */
  61
  62         return unregister_cpu(&sysfs_cpus[num].cpu, parent);
  63 }
  64 EXPORT_SYMBOL(arch_register_cpu);
  65 EXPORT_SYMBOL(arch_unregister_cpu);
  66 #endif /*CONFIG_HOTPLUG_CPU*/
  67
  68
  69 static int __init topology_init(void)
  70 {
  71         int i, err = 0;
  72
  73 #ifdef CONFIG_NUMA
  74         sysfs_nodes = kzalloc(sizeof(struct node) * MAX_NUMNODES, GFP_KERNEL);
  75         if (!sysfs_nodes) {
  76                 err = -ENOMEM;
  77                 goto out;
  78         }
  79
  80         /*
  81          * MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
  82          */
  83         for_each_online_node(i) {
  84                 if ((err = register_node(&sysfs_nodes[i], i, 0)))
  85                         goto out;
  86         }
  87 #endif
  88
  89         sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
  90         if (!sysfs_cpus) {
  91                 err = -ENOMEM;
  92                 goto out;
  93         }
  94
  95         for_each_present_cpu(i) {
  96                 if((err = arch_register_cpu(i)))
  97                         goto out;
  98         }
  99 out:
 100         return err;
 101 }
 102
 103 subsys_initcall(topology_init);