Kuninori Morimoto | 5933f6d | 2018-12-28 00:32:24 -0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Paul Mundt | 05a1178 | 2007-06-07 11:29:37 +0900 | [diff] [blame] | 2 | /* |
| 3 | * arch/sh/kernel/topology.c |
| 4 | * |
| 5 | * Copyright (C) 2007 Paul Mundt |
Paul Mundt | 05a1178 | 2007-06-07 11:29:37 +0900 | [diff] [blame] | 6 | */ |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 7 | #include <linux/cpu.h> |
| 8 | #include <linux/cpumask.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/percpu.h> |
Nobuhiro Iwamatsu | 6988d64 | 2011-08-26 05:05:41 +0000 | [diff] [blame] | 11 | #include <linux/topology.h> |
Paul Mundt | d22d9b3 | 2007-06-01 14:21:13 +0900 | [diff] [blame] | 12 | #include <linux/node.h> |
| 13 | #include <linux/nodemask.h> |
Paul Gortmaker | f7be345 | 2011-07-31 19:20:02 -0400 | [diff] [blame] | 14 | #include <linux/export.h> |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 15 | |
| 16 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
| 17 | |
Paul Mundt | 896f0c0 | 2009-10-16 18:00:02 +0900 | [diff] [blame] | 18 | cpumask_t cpu_core_map[NR_CPUS]; |
Aurelien Jarno | 24ee7d7 | 2011-01-18 20:55:34 +0000 | [diff] [blame] | 19 | EXPORT_SYMBOL(cpu_core_map); |
Paul Mundt | 896f0c0 | 2009-10-16 18:00:02 +0900 | [diff] [blame] | 20 | |
Rich Felker | ccc7d5a | 2016-03-29 22:50:02 +0000 | [diff] [blame] | 21 | static cpumask_t cpu_coregroup_map(int cpu) |
Paul Mundt | 896f0c0 | 2009-10-16 18:00:02 +0900 | [diff] [blame] | 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 | */ |
Rusty Russell | 004f4ce | 2012-02-15 15:28:04 +1030 | [diff] [blame] | 27 | return *cpu_possible_mask; |
Paul Mundt | 896f0c0 | 2009-10-16 18:00:02 +0900 | [diff] [blame] | 28 | } |
| 29 | |
Rich Felker | ccc7d5a | 2016-03-29 22:50:02 +0000 | [diff] [blame] | 30 | const struct cpumask *cpu_coregroup_mask(int cpu) |
Paul Mundt | 896f0c0 | 2009-10-16 18:00:02 +0900 | [diff] [blame] | 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 | |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 45 | static int __init topology_init(void) |
| 46 | { |
| 47 | int i, ret; |
| 48 | |
Paul Mundt | d22d9b3 | 2007-06-01 14:21:13 +0900 | [diff] [blame] | 49 | #ifdef CONFIG_NEED_MULTIPLE_NODES |
| 50 | for_each_online_node(i) |
| 51 | register_one_node(i); |
| 52 | #endif |
| 53 | |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 54 | for_each_present_cpu(i) { |
Paul Mundt | 9e8c5be | 2010-04-26 18:20:29 +0900 | [diff] [blame] | 55 | struct cpu *c = &per_cpu(cpu_devices, i); |
| 56 | |
| 57 | c->hotpluggable = 1; |
| 58 | |
| 59 | ret = register_cpu(c, i); |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 60 | if (unlikely(ret)) |
| 61 | printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n", |
Harvey Harrison | 866e6b9 | 2008-03-04 15:23:47 -0800 | [diff] [blame] | 62 | __func__, i, ret); |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 63 | } |
| 64 | |
Paul Mundt | 05a1178 | 2007-06-07 11:29:37 +0900 | [diff] [blame] | 65 | #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) |
| 66 | /* |
| 67 | * In the UP case, make sure the CPU association is still |
| 68 | * registered under each node. Without this, sysfs fails |
| 69 | * to make the connection between nodes other than node0 |
| 70 | * and cpu0. |
| 71 | */ |
| 72 | for_each_online_node(i) |
| 73 | if (i != numa_node_id()) |
| 74 | register_cpu_under_node(raw_smp_processor_id(), i); |
| 75 | #endif |
| 76 | |
Paul Mundt | 7a302a9 | 2007-05-14 12:50:43 +0900 | [diff] [blame] | 77 | return 0; |
| 78 | } |
| 79 | subsys_initcall(topology_init); |