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(die_id);
 47static DEVICE_ATTR_RO(die_id);
 48
 49define_id_show_func(core_id);
 50static DEVICE_ATTR_RO(core_id);
 51
 52define_siblings_show_func(thread_siblings, sibling_cpumask);
 53static DEVICE_ATTR_RO(thread_siblings);
 54static DEVICE_ATTR_RO(thread_siblings_list);
 55
 56define_siblings_show_func(core_cpus, sibling_cpumask);
 57static DEVICE_ATTR_RO(core_cpus);
 58static DEVICE_ATTR_RO(core_cpus_list);
 59
 60define_siblings_show_func(core_siblings, core_cpumask);
 61static DEVICE_ATTR_RO(core_siblings);
 62static DEVICE_ATTR_RO(core_siblings_list);
 63
 64define_siblings_show_func(die_cpus, die_cpumask);
 65static DEVICE_ATTR_RO(die_cpus);
 66static DEVICE_ATTR_RO(die_cpus_list);
 67
 68define_siblings_show_func(package_cpus, core_cpumask);
 69static DEVICE_ATTR_RO(package_cpus);
 70static DEVICE_ATTR_RO(package_cpus_list);
 71
 72#ifdef CONFIG_SCHED_BOOK
 73define_id_show_func(book_id);
 74static DEVICE_ATTR_RO(book_id);
 75define_siblings_show_func(book_siblings, book_cpumask);
 76static DEVICE_ATTR_RO(book_siblings);
 77static DEVICE_ATTR_RO(book_siblings_list);
 78#endif
 79
 80#ifdef CONFIG_SCHED_DRAWER
 81define_id_show_func(drawer_id);
 82static DEVICE_ATTR_RO(drawer_id);
 83define_siblings_show_func(drawer_siblings, drawer_cpumask);
 84static DEVICE_ATTR_RO(drawer_siblings);
 85static DEVICE_ATTR_RO(drawer_siblings_list);
 86#endif
 87
 88static struct attribute *default_attrs[] = {
 89	&dev_attr_physical_package_id.attr,
 90	&dev_attr_die_id.attr,
 91	&dev_attr_core_id.attr,
 92	&dev_attr_thread_siblings.attr,
 93	&dev_attr_thread_siblings_list.attr,
 94	&dev_attr_core_cpus.attr,
 95	&dev_attr_core_cpus_list.attr,
 96	&dev_attr_core_siblings.attr,
 97	&dev_attr_core_siblings_list.attr,
 98	&dev_attr_die_cpus.attr,
 99	&dev_attr_die_cpus_list.attr,
100	&dev_attr_package_cpus.attr,
101	&dev_attr_package_cpus_list.attr,
102#ifdef CONFIG_SCHED_BOOK
103	&dev_attr_book_id.attr,
104	&dev_attr_book_siblings.attr,
105	&dev_attr_book_siblings_list.attr,
106#endif
107#ifdef CONFIG_SCHED_DRAWER
108	&dev_attr_drawer_id.attr,
109	&dev_attr_drawer_siblings.attr,
110	&dev_attr_drawer_siblings_list.attr,
111#endif
112	NULL
113};
114
115static const struct attribute_group topology_attr_group = {
116	.attrs = default_attrs,
117	.name = "topology"
118};
119
120/* Add/Remove cpu_topology interface for CPU device */
121static int topology_add_dev(unsigned int cpu)
122{
123	struct device *dev = get_cpu_device(cpu);
124
125	return sysfs_create_group(&dev->kobj, &topology_attr_group);
126}
127
128static int topology_remove_dev(unsigned int cpu)
129{
130	struct device *dev = get_cpu_device(cpu);
131
132	sysfs_remove_group(&dev->kobj, &topology_attr_group);
133	return 0;
134}
135
136static int __init topology_sysfs_init(void)
137{
138	return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
139				 "base/topology:prepare", topology_add_dev,
140				 topology_remove_dev);
141}
142
143device_initcall(topology_sysfs_init);

  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(die_id);
 47static DEVICE_ATTR_RO(die_id);
 48
 49define_id_show_func(core_id);
 50static DEVICE_ATTR_RO(core_id);
 51
 52define_siblings_show_func(thread_siblings, sibling_cpumask);
 53static DEVICE_ATTR_RO(thread_siblings);
 54static DEVICE_ATTR_RO(thread_siblings_list);
 55
 56define_siblings_show_func(core_cpus, sibling_cpumask);
 57static DEVICE_ATTR_RO(core_cpus);
 58static DEVICE_ATTR_RO(core_cpus_list);
 59
 60define_siblings_show_func(core_siblings, core_cpumask);
 61static DEVICE_ATTR_RO(core_siblings);
 62static DEVICE_ATTR_RO(core_siblings_list);
 63
 64define_siblings_show_func(die_cpus, die_cpumask);
 65static DEVICE_ATTR_RO(die_cpus);
 66static DEVICE_ATTR_RO(die_cpus_list);
 67
 68define_siblings_show_func(package_cpus, core_cpumask);
 69static DEVICE_ATTR_RO(package_cpus);
 70static DEVICE_ATTR_RO(package_cpus_list);
 71
 72#ifdef CONFIG_SCHED_BOOK
 73define_id_show_func(book_id);
 74static DEVICE_ATTR_RO(book_id);
 75define_siblings_show_func(book_siblings, book_cpumask);
 76static DEVICE_ATTR_RO(book_siblings);
 77static DEVICE_ATTR_RO(book_siblings_list);
 78#endif
 79
 80#ifdef CONFIG_SCHED_DRAWER
 81define_id_show_func(drawer_id);
 82static DEVICE_ATTR_RO(drawer_id);
 83define_siblings_show_func(drawer_siblings, drawer_cpumask);
 84static DEVICE_ATTR_RO(drawer_siblings);
 85static DEVICE_ATTR_RO(drawer_siblings_list);
 86#endif
 87
 88static struct attribute *default_attrs[] = {
 89	&dev_attr_physical_package_id.attr,
 90	&dev_attr_die_id.attr,
 91	&dev_attr_core_id.attr,
 92	&dev_attr_thread_siblings.attr,
 93	&dev_attr_thread_siblings_list.attr,
 94	&dev_attr_core_cpus.attr,
 95	&dev_attr_core_cpus_list.attr,
 96	&dev_attr_core_siblings.attr,
 97	&dev_attr_core_siblings_list.attr,
 98	&dev_attr_die_cpus.attr,
 99	&dev_attr_die_cpus_list.attr,
100	&dev_attr_package_cpus.attr,
101	&dev_attr_package_cpus_list.attr,
102#ifdef CONFIG_SCHED_BOOK
103	&dev_attr_book_id.attr,
104	&dev_attr_book_siblings.attr,
105	&dev_attr_book_siblings_list.attr,
106#endif
107#ifdef CONFIG_SCHED_DRAWER
108	&dev_attr_drawer_id.attr,
109	&dev_attr_drawer_siblings.attr,
110	&dev_attr_drawer_siblings_list.attr,
111#endif
112	NULL
113};
114
115static const struct attribute_group topology_attr_group = {
116	.attrs = default_attrs,
117	.name = "topology"
118};
119
120/* Add/Remove cpu_topology interface for CPU device */
121static int topology_add_dev(unsigned int cpu)
122{
123	struct device *dev = get_cpu_device(cpu);
124
125	return sysfs_create_group(&dev->kobj, &topology_attr_group);
126}
127
128static int topology_remove_dev(unsigned int cpu)
129{
130	struct device *dev = get_cpu_device(cpu);
131
132	sysfs_remove_group(&dev->kobj, &topology_attr_group);
133	return 0;
134}
135
136static int topology_sysfs_init(void)
137{
138	return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
139				 "base/topology:prepare", topology_add_dev,
140				 topology_remove_dev);
141}
142
143device_initcall(topology_sysfs_init);