1 /*
2 * Copyright (C) 2007 Paul Mundt
3 * Copyright (C) 2010 Imagination Technolohies Ltd.
4 *
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
8 */
9 #include <linux/cpu.h>
10 #include <linux/cpumask.h>
11 #include <linux/init.h>
12 #include <linux/percpu.h>
13 #include <linux/node.h>
14 #include <linux/nodemask.h>
15 #include <linux/topology.h>
16
17 #include <asm/cpu.h>
18
19 DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data);
20
21 cpumask_t cpu_core_map[NR_CPUS];
22 EXPORT_SYMBOL(cpu_core_map);
23
cpu_coregroup_map(unsigned int cpu)24 static cpumask_t cpu_coregroup_map(unsigned int cpu)
25 {
26 return *cpu_possible_mask;
27 }
28
cpu_coregroup_mask(unsigned int cpu)29 const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
30 {
31 return &cpu_core_map[cpu];
32 }
33
arch_update_cpu_topology(void)34 int arch_update_cpu_topology(void)
35 {
36 unsigned int cpu;
37
38 for_each_possible_cpu(cpu)
39 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
40
41 return 0;
42 }
43
topology_init(void)44 static int __init topology_init(void)
45 {
46 int i, ret;
47
48 #ifdef CONFIG_NEED_MULTIPLE_NODES
49 for_each_online_node(i)
50 register_one_node(i);
51 #endif
52
53 for_each_present_cpu(i) {
54 struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
55 #ifdef CONFIG_HOTPLUG_CPU
56 cpuinfo->cpu.hotpluggable = 1;
57 #endif
58 ret = register_cpu(&cpuinfo->cpu, i);
59 if (unlikely(ret))
60 pr_warn("%s: register_cpu %d failed (%d)\n",
61 __func__, i, ret);
62 }
63
64 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
65 /*
66 * In the UP case, make sure the CPU association is still
67 * registered under each node. Without this, sysfs fails
68 * to make the connection between nodes other than node0
69 * and cpu0.
70 */
71 for_each_online_node(i)
72 if (i != numa_node_id())
73 register_cpu_under_node(raw_smp_processor_id(), i);
74 #endif
75
76 return 0;
77 }
78 subsys_initcall(topology_init);
79