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 static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
50 {
51 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
52 int n = 0;
53
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';
60 }
61 return n;
62 }
63 #endif
64
65 #ifdef arch_provides_topology_pointers
66 #define define_siblings_show_map(name) \
67 static ssize_t show_##name(struct sys_device *dev, \
68 struct sysdev_attribute *attr, char *buf) \
69 { \
70 unsigned int cpu = dev->id; \
71 return show_cpumap(0, topology_##name(cpu), buf); \
72 }
73
74 #define define_siblings_show_list(name) \
75 static ssize_t show_##name##_list(struct sys_device *dev, \
76 struct sysdev_attribute *attr, \
77 char *buf) \
78 { \
79 unsigned int cpu = dev->id; \
80 return show_cpumap(1, topology_##name(cpu), buf); \
81 }
82
83 #else
84 #define define_siblings_show_map(name) \
85 static ssize_t show_##name(struct sys_device *dev, \
86 struct sysdev_attribute *attr, char *buf) \
87 { \
88 return show_cpumap(0, topology_##name(dev->id), buf); \
89 }
90
91 #define define_siblings_show_list(name) \
92 static ssize_t show_##name##_list(struct sys_device *dev, \
93 struct sysdev_attribute *attr, \
94 char *buf) \
95 { \
96 return show_cpumap(1, topology_##name(dev->id), buf); \
97 }
98 #endif
99
100 #define define_siblings_show_func(name) \
101 define_siblings_show_map(name); define_siblings_show_list(name)
102
103 define_id_show_func(physical_package_id);
104 define_one_ro(physical_package_id);
105
106 define_id_show_func(core_id);
107 define_one_ro(core_id);
108
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);
112
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);
116
117 static struct attribute *default_attrs[] = {
118 &attr_physical_package_id.attr,
119 &attr_core_id.attr,
120 &attr_thread_siblings.attr,
121 &attr_thread_siblings_list.attr,
122 &attr_core_siblings.attr,
123 &attr_core_siblings_list.attr,
124 NULL
125 };
126
127 static struct attribute_group topology_attr_group = {
128 .attrs = default_attrs,
129 .name = "topology"
130 };
131
132 /* Add/Remove cpu_topology interface for CPU device */
133 static int __cpuinit topology_add_dev(unsigned int cpu)
134 {
135 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
136
137 return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
138 }
139
140 static void __cpuinit topology_remove_dev(unsigned int cpu)
141 {
142 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
143
144 sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
145 }
146
147 static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
148 unsigned long action, void *hcpu)
149 {
150 unsigned int cpu = (unsigned long)hcpu;
151 int rc = 0;
152
153 switch (action) {
154 case CPU_UP_PREPARE:
155 case CPU_UP_PREPARE_FROZEN:
156 rc = topology_add_dev(cpu);
157 break;
158 case CPU_UP_CANCELED:
159 case CPU_UP_CANCELED_FROZEN:
160 case CPU_DEAD:
161 case CPU_DEAD_FROZEN:
162 topology_remove_dev(cpu);
163 break;
164 }
165 return rc ? NOTIFY_BAD : NOTIFY_OK;
166 }
167
168 static int __cpuinit topology_sysfs_init(void)
169 {
170 int cpu;
171 int rc;
172
173 for_each_online_cpu(cpu) {
174 rc = topology_add_dev(cpu);
175 if (rc)
176 return rc;
177 }
178 hotcpu_notifier(topology_cpu_callback, 0);
179
180 return 0;
181 }
182
183 device_initcall(topology_sysfs_init);
184
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