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[mirror_ubuntu-zesty-kernel.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/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) \
33 static 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) \
40 static 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) \
47 static 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
58 define_id_show_func(physical_package_id);
59 static DEVICE_ATTR_RO(physical_package_id);
60
61 define_id_show_func(core_id);
62 static DEVICE_ATTR_RO(core_id);
63
64 define_siblings_show_func(thread_siblings, sibling_cpumask);
65 static DEVICE_ATTR_RO(thread_siblings);
66 static DEVICE_ATTR_RO(thread_siblings_list);
67
68 define_siblings_show_func(core_siblings, core_cpumask);
69 static DEVICE_ATTR_RO(core_siblings);
70 static DEVICE_ATTR_RO(core_siblings_list);
71
72 #ifdef CONFIG_SCHED_BOOK
73 define_id_show_func(book_id);
74 static DEVICE_ATTR_RO(book_id);
75 define_siblings_show_func(book_siblings, book_cpumask);
76 static DEVICE_ATTR_RO(book_siblings);
77 static DEVICE_ATTR_RO(book_siblings_list);
78 #endif
79
80 #ifdef CONFIG_SCHED_DRAWER
81 define_id_show_func(drawer_id);
82 static DEVICE_ATTR_RO(drawer_id);
83 define_siblings_show_func(drawer_siblings, drawer_cpumask);
84 static DEVICE_ATTR_RO(drawer_siblings);
85 static DEVICE_ATTR_RO(drawer_siblings_list);
86 #endif
87
88 static 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
108 static struct attribute_group topology_attr_group = {
109 .attrs = default_attrs,
110 .name = "topology"
111 };
112
113 /* Add/Remove cpu_topology interface for CPU device */
114 static 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
121 static int 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 return 0;
127 }
128
129 static int topology_sysfs_init(void)
130 {
131 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
132 "base/topology:prepare", topology_add_dev,
133 topology_remove_dev);
134 }
135
136 device_initcall(topology_sysfs_init);