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73 lines
1.8 KiB
73 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* ia64 kernel NUMA specific stuff |
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* |
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* Copyright (C) 2002 Erich Focht <[email protected]> |
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* Copyright (C) 2004 Silicon Graphics, Inc. |
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* Jesse Barnes <[email protected]> |
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*/ |
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#include <linux/topology.h> |
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#include <linux/module.h> |
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#include <asm/processor.h> |
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#include <asm/smp.h> |
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u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; |
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EXPORT_SYMBOL(cpu_to_node_map); |
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cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; |
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EXPORT_SYMBOL(node_to_cpu_mask); |
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void map_cpu_to_node(int cpu, int nid) |
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{ |
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int oldnid; |
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if (nid < 0) { /* just initialize by zero */ |
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cpu_to_node_map[cpu] = 0; |
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return; |
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} |
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/* sanity check first */ |
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oldnid = cpu_to_node_map[cpu]; |
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if (cpumask_test_cpu(cpu, &node_to_cpu_mask[oldnid])) { |
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return; /* nothing to do */ |
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} |
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/* we don't have cpu-driven node hot add yet... |
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In usual case, node is created from SRAT at boot time. */ |
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if (!node_online(nid)) |
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nid = first_online_node; |
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cpu_to_node_map[cpu] = nid; |
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cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]); |
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return; |
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} |
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void unmap_cpu_from_node(int cpu, int nid) |
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{ |
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WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid])); |
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WARN_ON(cpu_to_node_map[cpu] != nid); |
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cpu_to_node_map[cpu] = 0; |
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cpumask_clear_cpu(cpu, &node_to_cpu_mask[nid]); |
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} |
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/** |
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* build_cpu_to_node_map - setup cpu to node and node to cpumask arrays |
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* |
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* Build cpu to node mapping and initialize the per node cpu masks using |
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* info from the node_cpuid array handed to us by ACPI. |
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*/ |
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void __init build_cpu_to_node_map(void) |
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{ |
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int cpu, i, node; |
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for(node=0; node < MAX_NUMNODES; node++) |
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cpumask_clear(&node_to_cpu_mask[node]); |
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for_each_possible_early_cpu(cpu) { |
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node = NUMA_NO_NODE; |
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for (i = 0; i < NR_CPUS; ++i) |
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if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { |
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node = node_cpuid[i].nid; |
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break; |
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} |
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map_cpu_to_node(cpu, node); |
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} |
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}
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