linux/audit.h: move ptrace.h include to kernel header
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / base / topology.c
blobae989c57cd5ec33cd1564ee949e0fab51b158b4a
1 /*
2 * driver/base/topology.c - Populate sysfs with cpu topology information
4 * Written by: Zhang Yanmin, Intel Corporation
6 * Copyright (C) 2006, Intel Corp.
8 * All rights reserved.
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.
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.
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.
26 #include <linux/init.h>
27 #include <linux/mm.h>
28 #include <linux/cpu.h>
29 #include <linux/module.h>
30 #include <linux/hardirq.h>
31 #include <linux/topology.h>
33 #define define_one_ro_named(_name, _func) \
34 static DEVICE_ATTR(_name, 0444, _func, NULL)
36 #define define_one_ro(_name) \
37 static DEVICE_ATTR(_name, 0444, show_##_name, NULL)
39 #define define_id_show_func(name) \
40 static ssize_t show_##name(struct device *dev, \
41 struct device_attribute *attr, char *buf) \
42 { \
43 unsigned int cpu = dev->id; \
44 return sprintf(buf, "%d\n", topology_##name(cpu)); \
47 #if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
48 defined(topology_book_cpumask)
49 static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
51 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
52 int n = 0;
54 if (len > 1) {
55 n = type?
56 cpulist_scnprintf(buf, len-2, mask) :
57 cpumask_scnprintf(buf, len-2, mask);
58 buf[n++] = '\n';
59 buf[n] = '\0';
61 return n;
63 #endif
65 #ifdef arch_provides_topology_pointers
66 #define define_siblings_show_map(name) \
67 static ssize_t show_##name(struct device *dev, \
68 struct device_attribute *attr, char *buf) \
69 { \
70 unsigned int cpu = dev->id; \
71 return show_cpumap(0, topology_##name(cpu), buf); \
74 #define define_siblings_show_list(name) \
75 static ssize_t show_##name##_list(struct device *dev, \
76 struct device_attribute *attr, \
77 char *buf) \
78 { \
79 unsigned int cpu = dev->id; \
80 return show_cpumap(1, topology_##name(cpu), buf); \
83 #else
84 #define define_siblings_show_map(name) \
85 static ssize_t show_##name(struct device *dev, \
86 struct device_attribute *attr, char *buf) \
87 { \
88 return show_cpumap(0, topology_##name(dev->id), buf); \
91 #define define_siblings_show_list(name) \
92 static ssize_t show_##name##_list(struct device *dev, \
93 struct device_attribute *attr, \
94 char *buf) \
95 { \
96 return show_cpumap(1, topology_##name(dev->id), buf); \
98 #endif
100 #define define_siblings_show_func(name) \
101 define_siblings_show_map(name); define_siblings_show_list(name)
103 define_id_show_func(physical_package_id);
104 define_one_ro(physical_package_id);
106 define_id_show_func(core_id);
107 define_one_ro(core_id);
109 define_siblings_show_func(thread_cpumask);
110 define_one_ro_named(thread_siblings, show_thread_cpumask);
111 define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
113 define_siblings_show_func(core_cpumask);
114 define_one_ro_named(core_siblings, show_core_cpumask);
115 define_one_ro_named(core_siblings_list, show_core_cpumask_list);
117 #ifdef CONFIG_SCHED_BOOK
118 define_id_show_func(book_id);
119 define_one_ro(book_id);
120 define_siblings_show_func(book_cpumask);
121 define_one_ro_named(book_siblings, show_book_cpumask);
122 define_one_ro_named(book_siblings_list, show_book_cpumask_list);
123 #endif
125 static struct attribute *default_attrs[] = {
126 &dev_attr_physical_package_id.attr,
127 &dev_attr_core_id.attr,
128 &dev_attr_thread_siblings.attr,
129 &dev_attr_thread_siblings_list.attr,
130 &dev_attr_core_siblings.attr,
131 &dev_attr_core_siblings_list.attr,
132 #ifdef CONFIG_SCHED_BOOK
133 &dev_attr_book_id.attr,
134 &dev_attr_book_siblings.attr,
135 &dev_attr_book_siblings_list.attr,
136 #endif
137 NULL
140 static struct attribute_group topology_attr_group = {
141 .attrs = default_attrs,
142 .name = "topology"
145 /* Add/Remove cpu_topology interface for CPU device */
146 static int __cpuinit topology_add_dev(unsigned int cpu)
148 struct device *dev = get_cpu_device(cpu);
150 return sysfs_create_group(&dev->kobj, &topology_attr_group);
153 static void __cpuinit topology_remove_dev(unsigned int cpu)
155 struct device *dev = get_cpu_device(cpu);
157 sysfs_remove_group(&dev->kobj, &topology_attr_group);
160 static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
161 unsigned long action, void *hcpu)
163 unsigned int cpu = (unsigned long)hcpu;
164 int rc = 0;
166 switch (action) {
167 case CPU_UP_PREPARE:
168 case CPU_UP_PREPARE_FROZEN:
169 rc = topology_add_dev(cpu);
170 break;
171 case CPU_UP_CANCELED:
172 case CPU_UP_CANCELED_FROZEN:
173 case CPU_DEAD:
174 case CPU_DEAD_FROZEN:
175 topology_remove_dev(cpu);
176 break;
178 return notifier_from_errno(rc);
181 static int __cpuinit topology_sysfs_init(void)
183 int cpu;
184 int rc;
186 for_each_online_cpu(cpu) {
187 rc = topology_add_dev(cpu);
188 if (rc)
189 return rc;
191 hotcpu_notifier(topology_cpu_callback, 0);
193 return 0;
196 device_initcall(topology_sysfs_init);