projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 8d7e3517 | 2 | /* |
| 8d7e3517 TL |
3 | * |
| 4 | * ia64 kernel NUMA specific stuff | |
| 5 | * | |
| 6 | * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de> | |
| 7 | * Copyright (C) 2004 Silicon Graphics, Inc. | |
| 8 | * Jesse Barnes <jbarnes@sgi.com> | |
| 9 | */ | |
| 8d7e3517 TL |
10 | #include <linux/topology.h> |
| 11 | #include <linux/module.h> | |
| 12 | #include <asm/processor.h> | |
| 13 | #include <asm/smp.h> | |
| 14 | ||
| a9de9835 | 15 | u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; |
| 8d7e3517 TL |
16 | EXPORT_SYMBOL(cpu_to_node_map); |
| 17 | ||
| 18 | cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; | |
| a406c366 | 19 | EXPORT_SYMBOL(node_to_cpu_mask); |
| 8d7e3517 | 20 | |
| ccce9bb8 | 21 | void map_cpu_to_node(int cpu, int nid) |
| 3212fe15 KH |
22 | { |
| 23 | int oldnid; | |
| 24 | if (nid < 0) { /* just initialize by zero */ | |
| 25 | cpu_to_node_map[cpu] = 0; | |
| 26 | return; | |
| 27 | } | |
| 28 | /* sanity check first */ | |
| 29 | oldnid = cpu_to_node_map[cpu]; | |
| 5d2068da | 30 | if (cpumask_test_cpu(cpu, &node_to_cpu_mask[oldnid])) { |
| 3212fe15 KH |
31 | return; /* nothing to do */ |
| 32 | } | |
| 33 | /* we don't have cpu-driven node hot add yet... | |
| 34 | In usual case, node is created from SRAT at boot time. */ | |
| 35 | if (!node_online(nid)) | |
| 36 | nid = first_online_node; | |
| 37 | cpu_to_node_map[cpu] = nid; | |
| 5d2068da | 38 | cpumask_set_cpu(cpu, &node_to_cpu_mask[nid]); |
| 3212fe15 KH |
39 | return; |
| 40 | } | |
| 41 | ||
| ccce9bb8 | 42 | void unmap_cpu_from_node(int cpu, int nid) |
| 3212fe15 | 43 | { |
| 5d2068da | 44 | WARN_ON(!cpumask_test_cpu(cpu, &node_to_cpu_mask[nid])); |
| 3212fe15 KH |
45 | WARN_ON(cpu_to_node_map[cpu] != nid); |
| 46 | cpu_to_node_map[cpu] = 0; | |
| 5d2068da | 47 | cpumask_clear_cpu(cpu, &node_to_cpu_mask[nid]); |
| 3212fe15 KH |
48 | } |
| 49 | ||
| 50 | ||
| 8d7e3517 TL |
51 | /** |
| 52 | * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays | |
| 53 | * | |
| 54 | * Build cpu to node mapping and initialize the per node cpu masks using | |
| 55 | * info from the node_cpuid array handed to us by ACPI. | |
| 56 | */ | |
| 57 | void __init build_cpu_to_node_map(void) | |
| 58 | { | |
| 59 | int cpu, i, node; | |
| 60 | ||
| 61 | for(node=0; node < MAX_NUMNODES; node++) | |
| 5d2068da | 62 | cpumask_clear(&node_to_cpu_mask[node]); |
| 8d7e3517 | 63 | |
| 2c6e6db4 | 64 | for_each_possible_early_cpu(cpu) { |
| 98fa15f3 | 65 | node = NUMA_NO_NODE; |
| 8d7e3517 TL |
66 | for (i = 0; i < NR_CPUS; ++i) |
| 67 | if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { | |
| 68 | node = node_cpuid[i].nid; | |
| 69 | break; | |
| 70 | } | |
| 3212fe15 | 71 | map_cpu_to_node(cpu, node); |
| 8d7e3517 TL |
72 | } |
| 73 | } |