1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * arch/sh/kernel/topology.c |
4 | * |
5 | * Copyright (C) 2007 Paul Mundt |
6 | */ |
7 | #include <linux/cpu.h> |
8 | #include <linux/cpumask.h> |
9 | #include <linux/init.h> |
10 | #include <linux/percpu.h> |
11 | #include <linux/topology.h> |
12 | #include <linux/node.h> |
13 | #include <linux/nodemask.h> |
14 | #include <linux/export.h> |
15 | |
16 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
17 | |
18 | cpumask_t cpu_core_map[NR_CPUS]; |
19 | EXPORT_SYMBOL(cpu_core_map); |
20 | |
21 | static cpumask_t cpu_coregroup_map(int cpu) |
22 | { |
23 | /* |
24 | * Presently all SH-X3 SMP cores are multi-cores, so just keep it |
25 | * simple until we have a method for determining topology.. |
26 | */ |
27 | return *cpu_possible_mask; |
28 | } |
29 | |
30 | const struct cpumask *cpu_coregroup_mask(int cpu) |
31 | { |
32 | return &cpu_core_map[cpu]; |
33 | } |
34 | |
35 | int arch_update_cpu_topology(void) |
36 | { |
37 | unsigned int cpu; |
38 | |
39 | for_each_possible_cpu(cpu) |
40 | cpu_core_map[cpu] = cpu_coregroup_map(cpu); |
41 | |
42 | return 0; |
43 | } |
44 | |
45 | static int __init topology_init(void) |
46 | { |
47 | int i, ret; |
48 | |
49 | for_each_present_cpu(i) { |
50 | struct cpu *c = &per_cpu(cpu_devices, i); |
51 | |
52 | c->hotpluggable = 1; |
53 | |
54 | ret = register_cpu(cpu: c, num: i); |
55 | if (unlikely(ret)) |
56 | printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n" , |
57 | __func__, i, ret); |
58 | } |
59 | |
60 | #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) |
61 | /* |
62 | * In the UP case, make sure the CPU association is still |
63 | * registered under each node. Without this, sysfs fails |
64 | * to make the connection between nodes other than node0 |
65 | * and cpu0. |
66 | */ |
67 | for_each_online_node(i) |
68 | if (i != numa_node_id()) |
69 | register_cpu_under_node(raw_smp_processor_id(), i); |
70 | #endif |
71 | |
72 | return 0; |
73 | } |
74 | subsys_initcall(topology_init); |
75 | |