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26#include <linux/mm.h>
27#include <linux/cpu.h>
28#include <linux/module.h>
29#include <linux/hardirq.h>
30#include <linux/topology.h>
31
32#define define_id_show_func(name) \
33static ssize_t name##_show(struct device *dev, \
34 struct device_attribute *attr, char *buf) \
35{ \
36 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
37}
38
39#define define_siblings_show_map(name, mask) \
40static ssize_t name##_show(struct device *dev, \
41 struct device_attribute *attr, char *buf) \
42{ \
43 return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
44}
45
46#define define_siblings_show_list(name, mask) \
47static ssize_t name##_list_show(struct device *dev, \
48 struct device_attribute *attr, \
49 char *buf) \
50{ \
51 return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
52}
53
54#define define_siblings_show_func(name, mask) \
55 define_siblings_show_map(name, mask); \
56 define_siblings_show_list(name, mask)
57
58define_id_show_func(physical_package_id);
59static DEVICE_ATTR_RO(physical_package_id);
60
61define_id_show_func(core_id);
62static DEVICE_ATTR_RO(core_id);
63
64define_siblings_show_func(thread_siblings, sibling_cpumask);
65static DEVICE_ATTR_RO(thread_siblings);
66static DEVICE_ATTR_RO(thread_siblings_list);
67
68define_siblings_show_func(core_siblings, core_cpumask);
69static DEVICE_ATTR_RO(core_siblings);
70static DEVICE_ATTR_RO(core_siblings_list);
71
72#ifdef CONFIG_SCHED_BOOK
73define_id_show_func(book_id);
74static DEVICE_ATTR_RO(book_id);
75define_siblings_show_func(book_siblings, book_cpumask);
76static DEVICE_ATTR_RO(book_siblings);
77static DEVICE_ATTR_RO(book_siblings_list);
78#endif
79
80#ifdef CONFIG_SCHED_DRAWER
81define_id_show_func(drawer_id);
82static DEVICE_ATTR_RO(drawer_id);
83define_siblings_show_func(drawer_siblings, drawer_cpumask);
84static DEVICE_ATTR_RO(drawer_siblings);
85static DEVICE_ATTR_RO(drawer_siblings_list);
86#endif
87
88static struct attribute *default_attrs[] = {
89 &dev_attr_physical_package_id.attr,
90 &dev_attr_core_id.attr,
91 &dev_attr_thread_siblings.attr,
92 &dev_attr_thread_siblings_list.attr,
93 &dev_attr_core_siblings.attr,
94 &dev_attr_core_siblings_list.attr,
95#ifdef CONFIG_SCHED_BOOK
96 &dev_attr_book_id.attr,
97 &dev_attr_book_siblings.attr,
98 &dev_attr_book_siblings_list.attr,
99#endif
100#ifdef CONFIG_SCHED_DRAWER
101 &dev_attr_drawer_id.attr,
102 &dev_attr_drawer_siblings.attr,
103 &dev_attr_drawer_siblings_list.attr,
104#endif
105 NULL
106};
107
108static struct attribute_group topology_attr_group = {
109 .attrs = default_attrs,
110 .name = "topology"
111};
112
113
114static int topology_add_dev(unsigned int cpu)
115{
116 struct device *dev = get_cpu_device(cpu);
117
118 return sysfs_create_group(&dev->kobj, &topology_attr_group);
119}
120
121static void topology_remove_dev(unsigned int cpu)
122{
123 struct device *dev = get_cpu_device(cpu);
124
125 sysfs_remove_group(&dev->kobj, &topology_attr_group);
126}
127
128static int topology_cpu_callback(struct notifier_block *nfb,
129 unsigned long action, void *hcpu)
130{
131 unsigned int cpu = (unsigned long)hcpu;
132 int rc = 0;
133
134 switch (action) {
135 case CPU_UP_PREPARE:
136 case CPU_UP_PREPARE_FROZEN:
137 rc = topology_add_dev(cpu);
138 break;
139 case CPU_UP_CANCELED:
140 case CPU_UP_CANCELED_FROZEN:
141 case CPU_DEAD:
142 case CPU_DEAD_FROZEN:
143 topology_remove_dev(cpu);
144 break;
145 }
146 return notifier_from_errno(rc);
147}
148
149static int topology_sysfs_init(void)
150{
151 int cpu;
152 int rc = 0;
153
154 cpu_notifier_register_begin();
155
156 for_each_online_cpu(cpu) {
157 rc = topology_add_dev(cpu);
158 if (rc)
159 goto out;
160 }
161 __hotcpu_notifier(topology_cpu_callback, 0);
162
163out:
164 cpu_notifier_register_done();
165 return rc;
166}
167
168device_initcall(topology_sysfs_init);
169