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