diff options
Diffstat (limited to 'arch/ia64/kernel/numa.c')
| -rw-r--r-- | arch/ia64/kernel/numa.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/arch/ia64/kernel/numa.c b/arch/ia64/kernel/numa.c new file mode 100644 index 000000000..92c376279 --- /dev/null +++ b/arch/ia64/kernel/numa.c @@ -0,0 +1,85 @@ +/* + * 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 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 (cpumask_test_cpu(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; + cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]); + return; +} + +void unmap_cpu_from_node(int cpu, int nid) +{ + WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid])); + WARN_ON(cpu_to_node_map[cpu] != nid); + cpu_to_node_map[cpu] = 0; + cpumask_clear_cpu(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++) + cpumask_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); + } +} |