regmap: Fix cache defaults initialization from raw cache defaults
[linux-2.6.git] / drivers / base / topology.c
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/hardirq.h>
32 #include <linux/topology.h>
33
34 #define define_one_ro_named(_name, _func)                               \
35 static SYSDEV_ATTR(_name, 0444, _func, NULL)
36
37 #define define_one_ro(_name)                            \
38 static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
39
40 #define define_id_show_func(name)                               \
41 static ssize_t show_##name(struct sys_device *dev,              \
42                 struct sysdev_attribute *attr, char *buf)       \
43 {                                                               \
44         unsigned int cpu = dev->id;                             \
45         return sprintf(buf, "%d\n", topology_##name(cpu));      \
46 }
47
48 #if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
49     defined(topology_book_cpumask)
50 static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
51 {
52         ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
53         int n = 0;
54
55         if (len > 1) {
56                 n = type?
57                         cpulist_scnprintf(buf, len-2, mask) :
58                         cpumask_scnprintf(buf, len-2, mask);
59                 buf[n++] = '\n';
60                 buf[n] = '\0';
61         }
62         return n;
63 }
64 #endif
65
66 #ifdef arch_provides_topology_pointers
67 #define define_siblings_show_map(name)                                  \
68 static ssize_t show_##name(struct sys_device *dev,                      \
69                            struct sysdev_attribute *attr, char *buf)    \
70 {                                                                       \
71         unsigned int cpu = dev->id;                                     \
72         return show_cpumap(0, topology_##name(cpu), buf);               \
73 }
74
75 #define define_siblings_show_list(name)                                 \
76 static ssize_t show_##name##_list(struct sys_device *dev,               \
77                                   struct sysdev_attribute *attr,        \
78                                   char *buf)                            \
79 {                                                                       \
80         unsigned int cpu = dev->id;                                     \
81         return show_cpumap(1, topology_##name(cpu), buf);               \
82 }
83
84 #else
85 #define define_siblings_show_map(name)                                  \
86 static ssize_t show_##name(struct sys_device *dev,                      \
87                            struct sysdev_attribute *attr, char *buf)    \
88 {                                                                       \
89         return show_cpumap(0, topology_##name(dev->id), buf);           \
90 }
91
92 #define define_siblings_show_list(name)                                 \
93 static ssize_t show_##name##_list(struct sys_device *dev,               \
94                                   struct sysdev_attribute *attr,        \
95                                   char *buf)                            \
96 {                                                                       \
97         return show_cpumap(1, topology_##name(dev->id), buf);           \
98 }
99 #endif
100
101 #define define_siblings_show_func(name)         \
102         define_siblings_show_map(name); define_siblings_show_list(name)
103
104 define_id_show_func(physical_package_id);
105 define_one_ro(physical_package_id);
106
107 define_id_show_func(core_id);
108 define_one_ro(core_id);
109
110 define_siblings_show_func(thread_cpumask);
111 define_one_ro_named(thread_siblings, show_thread_cpumask);
112 define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
113
114 define_siblings_show_func(core_cpumask);
115 define_one_ro_named(core_siblings, show_core_cpumask);
116 define_one_ro_named(core_siblings_list, show_core_cpumask_list);
117
118 #ifdef CONFIG_SCHED_BOOK
119 define_id_show_func(book_id);
120 define_one_ro(book_id);
121 define_siblings_show_func(book_cpumask);
122 define_one_ro_named(book_siblings, show_book_cpumask);
123 define_one_ro_named(book_siblings_list, show_book_cpumask_list);
124 #endif
125
126 static struct attribute *default_attrs[] = {
127         &attr_physical_package_id.attr,
128         &attr_core_id.attr,
129         &attr_thread_siblings.attr,
130         &attr_thread_siblings_list.attr,
131         &attr_core_siblings.attr,
132         &attr_core_siblings_list.attr,
133 #ifdef CONFIG_SCHED_BOOK
134         &attr_book_id.attr,
135         &attr_book_siblings.attr,
136         &attr_book_siblings_list.attr,
137 #endif
138         NULL
139 };
140
141 static struct attribute_group topology_attr_group = {
142         .attrs = default_attrs,
143         .name = "topology"
144 };
145
146 /* Add/Remove cpu_topology interface for CPU device */
147 static int __cpuinit topology_add_dev(unsigned int cpu)
148 {
149         struct sys_device *sys_dev = get_cpu_sysdev(cpu);
150
151         return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
152 }
153
154 static void __cpuinit topology_remove_dev(unsigned int cpu)
155 {
156         struct sys_device *sys_dev = get_cpu_sysdev(cpu);
157
158         sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
159 }
160
161 static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
162                                            unsigned long action, void *hcpu)
163 {
164         unsigned int cpu = (unsigned long)hcpu;
165         int rc = 0;
166
167         switch (action) {
168         case CPU_UP_PREPARE:
169         case CPU_UP_PREPARE_FROZEN:
170                 rc = topology_add_dev(cpu);
171                 break;
172         case CPU_UP_CANCELED:
173         case CPU_UP_CANCELED_FROZEN:
174         case CPU_DEAD:
175         case CPU_DEAD_FROZEN:
176                 topology_remove_dev(cpu);
177                 break;
178         }
179         return notifier_from_errno(rc);
180 }
181
182 static int __cpuinit topology_sysfs_init(void)
183 {
184         int cpu;
185         int rc;
186
187         for_each_online_cpu(cpu) {
188                 rc = topology_add_dev(cpu);
189                 if (rc)
190                         return rc;
191         }
192         hotcpu_notifier(topology_cpu_callback, 0);
193
194         return 0;
195 }
196
197 device_initcall(topology_sysfs_init);