/* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * ia64 kernel NUMA specific stuff * * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de> * Copyright (C) 2004 Silicon Graphics, Inc. * Jesse Barnes <jbarnes@sgi.com> */ #include <linux/topology.h> #include <linux/module.h> #include <asm/processor.h> #include <asm/smp.h> u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; EXPORT_SYMBOL(cpu_to_node_map); cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; EXPORT_SYMBOL(node_to_cpu_mask); void __cpuinit map_cpu_to_node(int cpu, int nid) { int oldnid; if (nid < 0) { /* just initialize by zero */ cpu_to_node_map[cpu] = 0; return; } /* sanity check first */ oldnid = cpu_to_node_map[cpu]; if (cpu_isset(cpu, node_to_cpu_mask[oldnid])) { return; /* nothing to do */ } /* we don't have cpu-driven node hot add yet... In usual case, node is created from SRAT at boot time. */ if (!node_online(nid)) nid = first_online_node; cpu_to_node_map[cpu] = nid; cpu_set(cpu, node_to_cpu_mask[nid]); return; } void __cpuinit unmap_cpu_from_node(int cpu, int nid) { WARN_ON(!cpu_isset(cpu, node_to_cpu_mask[nid])); WARN_ON(cpu_to_node_map[cpu] != nid); cpu_to_node_map[cpu] = 0; cpu_clear(cpu, node_to_cpu_mask[nid]); } /** * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays * * Build cpu to node mapping and initialize the per node cpu masks using * info from the node_cpuid array handed to us by ACPI. */ void __init build_cpu_to_node_map(void) { int cpu, i, node; for(node=0; node < MAX_NUMNODES; node++) cpus_clear(node_to_cpu_mask[node]); for_each_possible_early_cpu(cpu) { node = -1; for (i = 0; i < NR_CPUS; ++i) if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { node = node_cpuid[i].nid; break; } map_cpu_to_node(cpu, node); } }