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Merge branch 'sbp2-spindown' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee139...
[mirror_ubuntu-artful-kernel.git] / drivers / base / topology.c
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1/*
2 * driver/base/topology.c - Populate sysfs with cpu topology information
3 *
4 * Written by: Zhang Yanmin, Intel Corporation
5 *
6 * Copyright (C) 2006, Intel Corp.
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 */
26#include <linux/sysdev.h>
27#include <linux/init.h>
28#include <linux/mm.h>
29#include <linux/cpu.h>
30#include <linux/module.h>
31#include <linux/topology.h>
32
33#define define_one_ro(_name) \
34static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
35
36#define define_id_show_func(name) \
37static ssize_t show_##name(struct sys_device *dev, char *buf) \
38{ \
39 unsigned int cpu = dev->id; \
40 return sprintf(buf, "%d\n", topology_##name(cpu)); \
41}
42
23ca4bba 43#if defined(topology_thread_siblings) || defined(topology_core_siblings)
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44static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf)
45{
46 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
47 int n = 0;
48
49 if (len > 1) {
50 n = type?
51 cpulist_scnprintf(buf, len-2, *mask):
52 cpumask_scnprintf(buf, len-2, *mask);
53 buf[n++] = '\n';
54 buf[n] = '\0';
55 }
56 return n;
57}
23ca4bba 58#endif
39106dcf 59
23ca4bba 60#ifdef arch_provides_topology_pointers
39106dcf 61#define define_siblings_show_map(name) \
23ca4bba 62static ssize_t show_##name(struct sys_device *dev, char *buf) \
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63{ \
64 unsigned int cpu = dev->id; \
65 return show_cpumap(0, &(topology_##name(cpu)), buf); \
66}
67
68#define define_siblings_show_list(name) \
23ca4bba 69static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \
69dcc991 70{ \
69dcc991 71 unsigned int cpu = dev->id; \
39106dcf 72 return show_cpumap(1, &(topology_##name(cpu)), buf); \
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73}
74
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75#else
76#define define_siblings_show_map(name) \
77static ssize_t show_##name(struct sys_device *dev, char *buf) \
78{ \
79 unsigned int cpu = dev->id; \
80 cpumask_t mask = topology_##name(cpu); \
81 return show_cpumap(0, &mask, buf); \
82}
83
84#define define_siblings_show_list(name) \
85static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \
86{ \
87 unsigned int cpu = dev->id; \
88 cpumask_t mask = topology_##name(cpu); \
89 return show_cpumap(1, &mask, buf); \
90}
91#endif
92
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93#define define_siblings_show_func(name) \
94 define_siblings_show_map(name); define_siblings_show_list(name)
95
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96define_id_show_func(physical_package_id);
97define_one_ro(physical_package_id);
69dcc991 98
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99define_id_show_func(core_id);
100define_one_ro(core_id);
69dcc991 101
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102define_siblings_show_func(thread_siblings);
103define_one_ro(thread_siblings);
39106dcf 104define_one_ro(thread_siblings_list);
69dcc991 105
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106define_siblings_show_func(core_siblings);
107define_one_ro(core_siblings);
39106dcf 108define_one_ro(core_siblings_list);
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109
110static struct attribute *default_attrs[] = {
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111 &attr_physical_package_id.attr,
112 &attr_core_id.attr,
113 &attr_thread_siblings.attr,
114 &attr_thread_siblings_list.attr,
115 &attr_core_siblings.attr,
116 &attr_core_siblings_list.attr,
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117 NULL
118};
119
120static struct attribute_group topology_attr_group = {
121 .attrs = default_attrs,
122 .name = "topology"
123};
124
125/* Add/Remove cpu_topology interface for CPU device */
06a4bcae 126static int __cpuinit topology_add_dev(unsigned int cpu)
69dcc991 127{
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128 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
129
9780e3e9 130 return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
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131}
132
06a4bcae 133static void __cpuinit topology_remove_dev(unsigned int cpu)
69dcc991 134{
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135 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
136
69dcc991 137 sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
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138}
139
9c7b216d 140static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
06a4bcae 141 unsigned long action, void *hcpu)
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142{
143 unsigned int cpu = (unsigned long)hcpu;
06a4bcae 144 int rc = 0;
69dcc991 145
69dcc991 146 switch (action) {
06a4bcae 147 case CPU_UP_PREPARE:
8bb78442 148 case CPU_UP_PREPARE_FROZEN:
06a4bcae 149 rc = topology_add_dev(cpu);
69dcc991 150 break;
06a4bcae 151 case CPU_UP_CANCELED:
8bb78442 152 case CPU_UP_CANCELED_FROZEN:
69dcc991 153 case CPU_DEAD:
8bb78442 154 case CPU_DEAD_FROZEN:
06a4bcae 155 topology_remove_dev(cpu);
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156 break;
157 }
06a4bcae 158 return rc ? NOTIFY_BAD : NOTIFY_OK;
69dcc991 159}
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160
161static int __cpuinit topology_sysfs_init(void)
162{
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163 int cpu;
164 int rc;
69dcc991 165
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HC
166 for_each_online_cpu(cpu) {
167 rc = topology_add_dev(cpu);
168 if (rc)
169 return rc;
69dcc991 170 }
06a4bcae 171 hotcpu_notifier(topology_cpu_callback, 0);
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172
173 return 0;
174}
175
176device_initcall(topology_sysfs_init);