tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * driver/base/topology.c - Populate sysfs with cpu topology information
4 *
5 * Written by: Zhang Yanmin, Intel Corporation
6 *
7 * Copyright (C) 2006, Intel Corp.
8 *
9 * All rights reserved.
10 */
11#include <linux/mm.h>
12#include <linux/cpu.h>
13#include <linux/module.h>
14#include <linux/hardirq.h>
15#include <linux/topology.h>
16
17#define define_id_show_func(name) \
18static ssize_t name##_show(struct device *dev, \
19 struct device_attribute *attr, char *buf) \
20{ \
21 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
22}
23
24#define define_siblings_show_map(name, mask) \
25static ssize_t name##_show(struct device *dev, \
26 struct device_attribute *attr, char *buf) \
27{ \
28 return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
29}
30
31#define define_siblings_show_list(name, mask) \
32static ssize_t name##_list_show(struct device *dev, \
33 struct device_attribute *attr, \
34 char *buf) \
35{ \
36 return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
37}
38
39#define define_siblings_show_func(name, mask) \
40 define_siblings_show_map(name, mask); \
41 define_siblings_show_list(name, mask)
42
43define_id_show_func(physical_package_id);
44static DEVICE_ATTR_RO(physical_package_id);
45
46define_id_show_func(core_id);
47static DEVICE_ATTR_RO(core_id);
48
49define_siblings_show_func(thread_siblings, sibling_cpumask);
50static DEVICE_ATTR_RO(thread_siblings);
51static DEVICE_ATTR_RO(thread_siblings_list);
52
53define_siblings_show_func(core_siblings, core_cpumask);
54static DEVICE_ATTR_RO(core_siblings);
55static DEVICE_ATTR_RO(core_siblings_list);
56
57#ifdef CONFIG_SCHED_BOOK
58define_id_show_func(book_id);
59static DEVICE_ATTR_RO(book_id);
60define_siblings_show_func(book_siblings, book_cpumask);
61static DEVICE_ATTR_RO(book_siblings);
62static DEVICE_ATTR_RO(book_siblings_list);
63#endif
64
65#ifdef CONFIG_SCHED_DRAWER
66define_id_show_func(drawer_id);
67static DEVICE_ATTR_RO(drawer_id);
68define_siblings_show_func(drawer_siblings, drawer_cpumask);
69static DEVICE_ATTR_RO(drawer_siblings);
70static DEVICE_ATTR_RO(drawer_siblings_list);
71#endif
72
73static struct attribute *default_attrs[] = {
74 &dev_attr_physical_package_id.attr,
75 &dev_attr_core_id.attr,
76 &dev_attr_thread_siblings.attr,
77 &dev_attr_thread_siblings_list.attr,
78 &dev_attr_core_siblings.attr,
79 &dev_attr_core_siblings_list.attr,
80#ifdef CONFIG_SCHED_BOOK
81 &dev_attr_book_id.attr,
82 &dev_attr_book_siblings.attr,
83 &dev_attr_book_siblings_list.attr,
84#endif
85#ifdef CONFIG_SCHED_DRAWER
86 &dev_attr_drawer_id.attr,
87 &dev_attr_drawer_siblings.attr,
88 &dev_attr_drawer_siblings_list.attr,
89#endif
90 NULL
91};
92
93static const struct attribute_group topology_attr_group = {
94 .attrs = default_attrs,
95 .name = "topology"
96};
97
98/* Add/Remove cpu_topology interface for CPU device */
99static int topology_add_dev(unsigned int cpu)
100{
101 struct device *dev = get_cpu_device(cpu);
102
103 return sysfs_create_group(&dev->kobj, &topology_attr_group);
104}
105
106static int topology_remove_dev(unsigned int cpu)
107{
108 struct device *dev = get_cpu_device(cpu);
109
110 sysfs_remove_group(&dev->kobj, &topology_attr_group);
111 return 0;
112}
113
114static int topology_sysfs_init(void)
115{
116 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
117 "base/topology:prepare", topology_add_dev,
118 topology_remove_dev);
119}
120
121device_initcall(topology_sysfs_init);