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/topology.h> 23 #include <linux/module.h> 24 #include <asm/processor.h> 25 #include <asm/smp.h> 26 27 u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; 28 EXPORT_SYMBOL(cpu_to_node_map); 29 30 cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; 31 EXPORT_SYMBOL(node_to_cpu_mask); 32 33 void map_cpu_to_node(int cpu, int nid) 34 { 35 int oldnid; 36 if (nid < 0) { /* just initialize by zero */ 37 cpu_to_node_map[cpu] = 0; 38 return; 39 } 40 /* sanity check first */ 41 oldnid = cpu_to_node_map[cpu]; 42 if (cpumask_test_cpu(cpu, &node_to_cpu_mask[oldnid])) { 43 return; /* nothing to do */ 44 } 45 /* we don't have cpu-driven node hot add yet... 46 In usual case, node is created from SRAT at boot time. */ 47 if (!node_online(nid)) 48 nid = first_online_node; 49 cpu_to_node_map[cpu] = nid; 50 cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]); 51 return; 52 } 53 54 void unmap_cpu_from_node(int cpu, int nid) 55 { 56 WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid])); 57 WARN_ON(cpu_to_node_map[cpu] != nid); 58 cpu_to_node_map[cpu] = 0; 59 cpumask_clear_cpu(cpu, &node_to_cpu_mask[nid]); 60 } 61 62 63 /** 64 * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays 65 * 66 * Build cpu to node mapping and initialize the per node cpu masks using 67 * info from the node_cpuid array handed to us by ACPI. 68 */ 69 void __init build_cpu_to_node_map(void) 70 { 71 int cpu, i, node; 72 73 for(node=0; node < MAX_NUMNODES; node++) 74 cpumask_clear(&node_to_cpu_mask[node]); 75 76 for_each_possible_early_cpu(cpu) { 77 node = -1; 78 for (i = 0; i < NR_CPUS; ++i) 79 if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { 80 node = node_cpuid[i].nid; 81 break; 82 } 83 map_cpu_to_node(cpu, node); 84 } 85 } 86