projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f6e763b9 MB |
1 | /* |
| 2 | * arch/arm64/kernel/topology.c | |
| 3 | * | |
| 4 | * Copyright (C) 2011,2013,2014 Linaro Limited. | |
| 5 | * | |
| 6 | * Based on the arm32 version written by Vincent Guittot in turn based on | |
| 7 | * arch/sh/kernel/topology.c | |
| 8 | * | |
| 9 | * This file is subject to the terms and conditions of the GNU General Public | |
| 10 | * License. See the file "COPYING" in the main directory of this archive | |
| 11 | * for more details. | |
| 12 | */ | |
| 13 | ||
| 14 | #include <linux/cpu.h> | |
| 15 | #include <linux/cpumask.h> | |
| 16 | #include <linux/init.h> | |
| 17 | #include <linux/percpu.h> | |
| 18 | #include <linux/node.h> | |
| 19 | #include <linux/nodemask.h> | |
| 20 | #include <linux/sched.h> | |
| 21 | ||
| 22 | #include <asm/topology.h> | |
| 23 | ||
| 24 | /* | |
| 25 | * cpu topology table | |
| 26 | */ | |
| 27 | struct cpu_topology cpu_topology[NR_CPUS]; | |
| 28 | EXPORT_SYMBOL_GPL(cpu_topology); | |
| 29 | ||
| 30 | const struct cpumask *cpu_coregroup_mask(int cpu) | |
| 31 | { | |
| 32 | return &cpu_topology[cpu].core_sibling; | |
| 33 | } | |
| 34 | ||
| 35 | static void update_siblings_masks(unsigned int cpuid) | |
| 36 | { | |
| 37 | struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid]; | |
| 38 | int cpu; | |
| 39 | ||
| 40 | if (cpuid_topo->cluster_id == -1) { | |
| 41 | /* | |
| 42 | * DT does not contain topology information for this cpu | |
| 43 | * reset it to default behaviour | |
| 44 | */ | |
| 45 | pr_debug("CPU%u: No topology information configured\n", cpuid); | |
| 46 | cpuid_topo->core_id = 0; | |
| 47 | cpumask_set_cpu(cpuid, &cpuid_topo->core_sibling); | |
| 48 | cpumask_set_cpu(cpuid, &cpuid_topo->thread_sibling); | |
| 49 | return; | |
| 50 | } | |
| 51 | ||
| 52 | /* update core and thread sibling masks */ | |
| 53 | for_each_possible_cpu(cpu) { | |
| 54 | cpu_topo = &cpu_topology[cpu]; | |
| 55 | ||
| 56 | if (cpuid_topo->cluster_id != cpu_topo->cluster_id) | |
| 57 | continue; | |
| 58 | ||
| 59 | cpumask_set_cpu(cpuid, &cpu_topo->core_sibling); | |
| 60 | if (cpu != cpuid) | |
| 61 | cpumask_set_cpu(cpu, &cpuid_topo->core_sibling); | |
| 62 | ||
| 63 | if (cpuid_topo->core_id != cpu_topo->core_id) | |
| 64 | continue; | |
| 65 | ||
| 66 | cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling); | |
| 67 | if (cpu != cpuid) | |
| 68 | cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling); | |
| 69 | } | |
| 70 | } | |
| 71 | ||
| 72 | void store_cpu_topology(unsigned int cpuid) | |
| 73 | { | |
| 74 | update_siblings_masks(cpuid); | |
| 75 | } | |
| 76 | ||
| 77 | /* | |
| 78 | * init_cpu_topology is called at boot when only one cpu is running | |
| 79 | * which prevent simultaneous write access to cpu_topology array | |
| 80 | */ | |
| 81 | void __init init_cpu_topology(void) | |
| 82 | { | |
| 83 | unsigned int cpu; | |
| 84 | ||
| 85 | /* init core mask and power*/ | |
| 86 | for_each_possible_cpu(cpu) { | |
| 87 | struct cpu_topology *cpu_topo = &cpu_topology[cpu]; | |
| 88 | ||
| 89 | cpu_topo->thread_id = -1; | |
| 90 | cpu_topo->core_id = -1; | |
| 91 | cpu_topo->cluster_id = -1; | |
| 92 | cpumask_clear(&cpu_topo->core_sibling); | |
| 93 | cpumask_clear(&cpu_topo->thread_sibling); | |
| 94 | } | |
| 95 | } |