summaryrefslogtreecommitdiff
path: root/drivers/base/topology.c
blob: fc24e89f9592f099e415f707eee30d333f4d0914 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
// SPDX-License-Identifier: GPL-2.0+
/*
 * driver/base/topology.c - Populate sysfs with cpu topology information
 *
 * Written by: Zhang Yanmin, Intel Corporation
 *
 * Copyright (C) 2006, Intel Corp.
 *
 * All rights reserved.
 */
#include <linux/mm.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/hardirq.h>
#include <linux/topology.h>

#define define_id_show_func(name)					\
static ssize_t name##_show(struct device *dev,				\
			   struct device_attribute *attr, char *buf)	\
{									\
	return sysfs_emit(buf, "%d\n", topology_##name(dev->id));	\
}

#define define_siblings_read_func(name, mask)					\
static ssize_t name##_read(struct file *file, struct kobject *kobj,		\
			   struct bin_attribute *attr, char *buf,		\
			   loff_t off, size_t count)				\
{										\
	struct device *dev = kobj_to_dev(kobj);                                 \
										\
	return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id),	\
					   off, count);                         \
}										\
										\
static ssize_t name##_list_read(struct file *file, struct kobject *kobj,	\
				struct bin_attribute *attr, char *buf,		\
				loff_t off, size_t count)			\
{										\
	struct device *dev = kobj_to_dev(kobj);					\
										\
	return cpumap_print_list_to_buf(buf, topology_##mask(dev->id),		\
					off, count);				\
}

define_id_show_func(physical_package_id);
static DEVICE_ATTR_RO(physical_package_id);

#ifdef TOPOLOGY_DIE_SYSFS
define_id_show_func(die_id);
static DEVICE_ATTR_RO(die_id);
#endif

#ifdef TOPOLOGY_CLUSTER_SYSFS
define_id_show_func(cluster_id);
static DEVICE_ATTR_RO(cluster_id);
#endif

define_id_show_func(core_id);
static DEVICE_ATTR_RO(core_id);

define_siblings_read_func(thread_siblings, sibling_cpumask);
static BIN_ATTR_RO(thread_siblings, 0);
static BIN_ATTR_RO(thread_siblings_list, 0);

define_siblings_read_func(core_cpus, sibling_cpumask);
static BIN_ATTR_RO(core_cpus, 0);
static BIN_ATTR_RO(core_cpus_list, 0);

define_siblings_read_func(core_siblings, core_cpumask);
static BIN_ATTR_RO(core_siblings, 0);
static BIN_ATTR_RO(core_siblings_list, 0);

#ifdef TOPOLOGY_CLUSTER_SYSFS
define_siblings_read_func(cluster_cpus, cluster_cpumask);
static BIN_ATTR_RO(cluster_cpus, 0);
static BIN_ATTR_RO(cluster_cpus_list, 0);
#endif

#ifdef TOPOLOGY_DIE_SYSFS
define_siblings_read_func(die_cpus, die_cpumask);
static BIN_ATTR_RO(die_cpus, 0);
static BIN_ATTR_RO(die_cpus_list, 0);
#endif

define_siblings_read_func(package_cpus, core_cpumask);
static BIN_ATTR_RO(package_cpus, 0);
static BIN_ATTR_RO(package_cpus_list, 0);

#ifdef TOPOLOGY_BOOK_SYSFS
define_id_show_func(book_id);
static DEVICE_ATTR_RO(book_id);
define_siblings_read_func(book_siblings, book_cpumask);
static BIN_ATTR_RO(book_siblings, 0);
static BIN_ATTR_RO(book_siblings_list, 0);
#endif

#ifdef TOPOLOGY_DRAWER_SYSFS
define_id_show_func(drawer_id);
static DEVICE_ATTR_RO(drawer_id);
define_siblings_read_func(drawer_siblings, drawer_cpumask);
static BIN_ATTR_RO(drawer_siblings, 0);
static BIN_ATTR_RO(drawer_siblings_list, 0);
#endif

static struct bin_attribute *bin_attrs[] = {
	&bin_attr_core_cpus,
	&bin_attr_core_cpus_list,
	&bin_attr_thread_siblings,
	&bin_attr_thread_siblings_list,
	&bin_attr_core_siblings,
	&bin_attr_core_siblings_list,
#ifdef TOPOLOGY_CLUSTER_SYSFS
	&bin_attr_cluster_cpus,
	&bin_attr_cluster_cpus_list,
#endif
#ifdef TOPOLOGY_DIE_SYSFS
	&bin_attr_die_cpus,
	&bin_attr_die_cpus_list,
#endif
	&bin_attr_package_cpus,
	&bin_attr_package_cpus_list,
#ifdef TOPOLOGY_BOOK_SYSFS
	&bin_attr_book_siblings,
	&bin_attr_book_siblings_list,
#endif
#ifdef TOPOLOGY_DRAWER_SYSFS
	&bin_attr_drawer_siblings,
	&bin_attr_drawer_siblings_list,
#endif
	NULL
};

static struct attribute *default_attrs[] = {
	&dev_attr_physical_package_id.attr,
#ifdef TOPOLOGY_DIE_SYSFS
	&dev_attr_die_id.attr,
#endif
#ifdef TOPOLOGY_CLUSTER_SYSFS
	&dev_attr_cluster_id.attr,
#endif
	&dev_attr_core_id.attr,
#ifdef TOPOLOGY_BOOK_SYSFS
	&dev_attr_book_id.attr,
#endif
#ifdef TOPOLOGY_DRAWER_SYSFS
	&dev_attr_drawer_id.attr,
#endif
	NULL
};

static const struct attribute_group topology_attr_group = {
	.attrs = default_attrs,
	.bin_attrs = bin_attrs,
	.name = "topology"
};

/* Add/Remove cpu_topology interface for CPU device */
static int topology_add_dev(unsigned int cpu)
{
	struct device *dev = get_cpu_device(cpu);

	return sysfs_create_group(&dev->kobj, &topology_attr_group);
}

static int topology_remove_dev(unsigned int cpu)
{
	struct device *dev = get_cpu_device(cpu);

	sysfs_remove_group(&dev->kobj, &topology_attr_group);
	return 0;
}

static int __init topology_sysfs_init(void)
{
	return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
				 "base/topology:prepare", topology_add_dev,
				 topology_remove_dev);
}

device_initcall(topology_sysfs_init);