summaryrefslogtreecommitdiffstats
path: root/drivers/base/topology.c
blob: d936fcf9f1fb985033a28092209d297721d5bfb4 (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
/*
 * driver/base/topology.c - Populate sysfs with cpu topology information
 *
 * Written by: Zhang Yanmin, Intel Corporation
 *
 * Copyright (C) 2006, Intel Corp.
 *
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 * NON INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#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 sprintf(buf, "%d\n", topology_##name(dev->id));	\
}

#define define_siblings_show_map(name, mask)				\
static ssize_t name##_show(struct device *dev,				\
			   struct device_attribute *attr, char *buf)	\
{									\
	return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
}

#define define_siblings_show_list(name, mask)				\
static ssize_t name##_list_show(struct device *dev,			\
				struct device_attribute *attr,		\
				char *buf)				\
{									\
	return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
}

#define define_siblings_show_func(name, mask)	\
	define_siblings_show_map(name, mask);	\
	define_siblings_show_list(name, mask)

define_id_show_func(physical_package_id);
static DEVICE_ATTR_RO(physical_package_id);

define_id_show_func(core_id);
static DEVICE_ATTR_RO(core_id);

define_siblings_show_func(thread_siblings, sibling_cpumask);
static DEVICE_ATTR_RO(thread_siblings);
static DEVICE_ATTR_RO(thread_siblings_list);

define_siblings_show_func(core_siblings, core_cpumask);
static DEVICE_ATTR_RO(core_siblings);
static DEVICE_ATTR_RO(core_siblings_list);

#ifdef CONFIG_SCHED_BOOK
define_id_show_func(book_id);
static DEVICE_ATTR_RO(book_id);
define_siblings_show_func(book_siblings, book_cpumask);
static DEVICE_ATTR_RO(book_siblings);
static DEVICE_ATTR_RO(book_siblings_list);
#endif

#ifdef CONFIG_SCHED_DRAWER
define_id_show_func(drawer_id);
static DEVICE_ATTR_RO(drawer_id);
define_siblings_show_func(drawer_siblings, drawer_cpumask);
static DEVICE_ATTR_RO(drawer_siblings);
static DEVICE_ATTR_RO(drawer_siblings_list);
#endif

static struct attribute *default_attrs[] = {
	&dev_attr_physical_package_id.attr,
	&dev_attr_core_id.attr,
	&dev_attr_thread_siblings.attr,
	&dev_attr_thread_siblings_list.attr,
	&dev_attr_core_siblings.attr,
	&dev_attr_core_siblings_list.attr,
#ifdef CONFIG_SCHED_BOOK
	&dev_attr_book_id.attr,
	&dev_attr_book_siblings.attr,
	&dev_attr_book_siblings_list.attr,
#endif
#ifdef CONFIG_SCHED_DRAWER
	&dev_attr_drawer_id.attr,
	&dev_attr_drawer_siblings.attr,
	&dev_attr_drawer_siblings_list.attr,
#endif
	NULL
};

static const struct attribute_group topology_attr_group = {
	.attrs = default_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 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);
OpenPOWER on IntegriCloud