arch/ia64/kernel/numa.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  15  *
  16  * ia64 kernel NUMA specific stuff
  17  *
  18  * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
  19  * Copyright (C) 2004 Silicon Graphics, Inc.
  20  *   Jesse Barnes <jbarnes@sgi.com>
  21  */
  22 #include <linux/config.h>
  23 #include <linux/topology.h>
  24 #include <linux/module.h>
  25 #include <asm/processor.h>
  26 #include <asm/smp.h>
  27
  28 u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
  29 EXPORT_SYMBOL(cpu_to_node_map);
  30
  31 cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
  32
  33 /**
  34  * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
  35  *
  36  * Build cpu to node mapping and initialize the per node cpu masks using
  37  * info from the node_cpuid array handed to us by ACPI.
  38  */
  39 void __init build_cpu_to_node_map(void)
  40 {
  41         int cpu, i, node;
  42
  43         for(node=0; node < MAX_NUMNODES; node++)
  44                 cpus_clear(node_to_cpu_mask[node]);
  45
  46         for(cpu = 0; cpu < NR_CPUS; ++cpu) {
  47                 node = -1;
  48                 for (i = 0; i < NR_CPUS; ++i)
  49                         if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
  50                                 node = node_cpuid[i].nid;
  51                                 break;
  52                         }
  53                 cpu_to_node_map[cpu] = (node >= 0) ? node : 0;
  54                 if (node >= 0)
  55                         cpu_set(cpu, node_to_cpu_mask[node]);
  56         }
  57 }