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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>
32
33#define define_one_ro_named(_name, _func) \
34 static DEVICE_ATTR(_name, 0444, _func, NULL)
35
36#define define_one_ro(_name) \
37 static DEVICE_ATTR(_name, 0444, show_##_name, NULL)
38
39#define define_id_show_func(name) \
40static 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)); \
45}
46
47#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
48 defined(topology_book_cpumask)
49static 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) \
67static 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); \
72}
73
74#define define_siblings_show_list(name) \
75static 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); \
81}
82
83#else
84#define define_siblings_show_map(name) \
85static 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); \
89}
90
91#define define_siblings_show_list(name) \
92static 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); \
97}
98#endif
99
100#define define_siblings_show_func(name) \
101 define_siblings_show_map(name); define_siblings_show_list(name)
102
103define_id_show_func(physical_package_id);
104define_one_ro(physical_package_id);
105
106define_id_show_func(core_id);
107define_one_ro(core_id);
108
109define_siblings_show_func(sibling_cpumask);
110define_one_ro_named(thread_siblings, show_sibling_cpumask);
111define_one_ro_named(thread_siblings_list, show_sibling_cpumask_list);
112
113define_siblings_show_func(core_cpumask);
114define_one_ro_named(core_siblings, show_core_cpumask);
115define_one_ro_named(core_siblings_list, show_core_cpumask_list);
116
117#ifdef CONFIG_SCHED_BOOK
118define_id_show_func(book_id);
119define_one_ro(book_id);
120define_siblings_show_func(book_cpumask);
121define_one_ro_named(book_siblings, show_book_cpumask);
122define_one_ro_named(book_siblings_list, show_book_cpumask_list);
123#endif
124
125#ifdef CONFIG_SCHED_DRAWER
126define_id_show_func(drawer_id);
127define_one_ro(drawer_id);
128define_siblings_show_func(drawer_cpumask);
129define_one_ro_named(drawer_siblings, show_drawer_cpumask);
130define_one_ro_named(drawer_siblings_list, show_drawer_cpumask_list);
131#endif
132
133static struct attribute *default_attrs[] = {
134 &dev_attr_physical_package_id.attr,
135 &dev_attr_core_id.attr,
136 &dev_attr_thread_siblings.attr,
137 &dev_attr_thread_siblings_list.attr,
138 &dev_attr_core_siblings.attr,
139 &dev_attr_core_siblings_list.attr,
140#ifdef CONFIG_SCHED_BOOK
141 &dev_attr_book_id.attr,
142 &dev_attr_book_siblings.attr,
143 &dev_attr_book_siblings_list.attr,
144#endif
145#ifdef CONFIG_SCHED_DRAWER
146 &dev_attr_drawer_id.attr,
147 &dev_attr_drawer_siblings.attr,
148 &dev_attr_drawer_siblings_list.attr,
149#endif
150 NULL
151};
152
153static struct attribute_group topology_attr_group = {
154 .attrs = default_attrs,
155 .name = "topology"
156};
157
158
159static int topology_add_dev(unsigned int cpu)
160{
161 struct device *dev = get_cpu_device(cpu);
162
163 return sysfs_create_group(&dev->kobj, &topology_attr_group);
164}
165
166static void topology_remove_dev(unsigned int cpu)
167{
168 struct device *dev = get_cpu_device(cpu);
169
170 sysfs_remove_group(&dev->kobj, &topology_attr_group);
171}
172
173static int topology_cpu_callback(struct notifier_block *nfb,
174 unsigned long action, void *hcpu)
175{
176 unsigned int cpu = (unsigned long)hcpu;
177 int rc = 0;
178
179 switch (action) {
180 case CPU_UP_PREPARE:
181 case CPU_UP_PREPARE_FROZEN:
182 rc = topology_add_dev(cpu);
183 break;
184 case CPU_UP_CANCELED:
185 case CPU_UP_CANCELED_FROZEN:
186 case CPU_DEAD:
187 case CPU_DEAD_FROZEN:
188 topology_remove_dev(cpu);
189 break;
190 }
191 return notifier_from_errno(rc);
192}
193
194static int topology_sysfs_init(void)
195{
196 int cpu;
197 int rc = 0;
198
199 cpu_notifier_register_begin();
200
201 for_each_online_cpu(cpu) {
202 rc = topology_add_dev(cpu);
203 if (rc)
204 goto out;
205 }
206 __hotcpu_notifier(topology_cpu_callback, 0);
207
208out:
209 cpu_notifier_register_done();
210 return rc;
211}
212
213device_initcall(topology_sysfs_init);
214
