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, fmt)					\
 18static ssize_t name##_show(struct device *dev,				\
 19			   struct device_attribute *attr, char *buf)	\
 20{									\
 21	return sysfs_emit(buf, fmt "\n", topology_##name(dev->id));	\
 22}
 23
 24#define define_siblings_read_func(name, mask)					\
 25static ssize_t name##_read(struct file *file, struct kobject *kobj,		\
 26			   struct bin_attribute *attr, char *buf,		\
 27			   loff_t off, size_t count)				\
 28{										\
 29	struct device *dev = kobj_to_dev(kobj);                                 \
 30										\
 31	return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id),	\
 32					   off, count);                         \
 33}										\
 34										\
 35static ssize_t name##_list_read(struct file *file, struct kobject *kobj,	\
 36				struct bin_attribute *attr, char *buf,		\
 37				loff_t off, size_t count)			\
 38{										\
 39	struct device *dev = kobj_to_dev(kobj);					\
 40										\
 41	return cpumap_print_list_to_buf(buf, topology_##mask(dev->id),		\
 42					off, count);				\
 43}
 44
 45define_id_show_func(physical_package_id, "%d");
 46static DEVICE_ATTR_RO(physical_package_id);
 47
 48#ifdef TOPOLOGY_DIE_SYSFS
 49define_id_show_func(die_id, "%d");
 50static DEVICE_ATTR_RO(die_id);
 51#endif
 52
 53#ifdef TOPOLOGY_CLUSTER_SYSFS
 54define_id_show_func(cluster_id, "%d");
 55static DEVICE_ATTR_RO(cluster_id);
 56#endif
 57
 58define_id_show_func(core_id, "%d");
 59static DEVICE_ATTR_RO(core_id);
 60
 61define_id_show_func(ppin, "0x%llx");
 62static DEVICE_ATTR_ADMIN_RO(ppin);
 63
 64define_siblings_read_func(thread_siblings, sibling_cpumask);
 65static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
 66static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);
 67
 68define_siblings_read_func(core_cpus, sibling_cpumask);
 69static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
 70static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);
 71
 72define_siblings_read_func(core_siblings, core_cpumask);
 73static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
 74static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);
 75
 76#ifdef TOPOLOGY_CLUSTER_SYSFS
 77define_siblings_read_func(cluster_cpus, cluster_cpumask);
 78static BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES);
 79static BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES);
 80#endif
 81
 82#ifdef TOPOLOGY_DIE_SYSFS
 83define_siblings_read_func(die_cpus, die_cpumask);
 84static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
 85static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
 86#endif
 87
 88define_siblings_read_func(package_cpus, core_cpumask);
 89static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
 90static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);
 91
 92#ifdef TOPOLOGY_BOOK_SYSFS
 93define_id_show_func(book_id, "%d");
 94static DEVICE_ATTR_RO(book_id);
 95define_siblings_read_func(book_siblings, book_cpumask);
 96static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
 97static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
 98#endif
 99
100#ifdef TOPOLOGY_DRAWER_SYSFS
101define_id_show_func(drawer_id, "%d");
102static DEVICE_ATTR_RO(drawer_id);
103define_siblings_read_func(drawer_siblings, drawer_cpumask);
104static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
105static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
106#endif
107
108static struct bin_attribute *bin_attrs[] = {
109	&bin_attr_core_cpus,
110	&bin_attr_core_cpus_list,
111	&bin_attr_thread_siblings,
112	&bin_attr_thread_siblings_list,
113	&bin_attr_core_siblings,
114	&bin_attr_core_siblings_list,
115#ifdef TOPOLOGY_CLUSTER_SYSFS
116	&bin_attr_cluster_cpus,
117	&bin_attr_cluster_cpus_list,
118#endif
119#ifdef TOPOLOGY_DIE_SYSFS
120	&bin_attr_die_cpus,
121	&bin_attr_die_cpus_list,
122#endif
123	&bin_attr_package_cpus,
124	&bin_attr_package_cpus_list,
125#ifdef TOPOLOGY_BOOK_SYSFS
126	&bin_attr_book_siblings,
127	&bin_attr_book_siblings_list,
128#endif
129#ifdef TOPOLOGY_DRAWER_SYSFS
130	&bin_attr_drawer_siblings,
131	&bin_attr_drawer_siblings_list,
132#endif
133	NULL
134};
135
136static struct attribute *default_attrs[] = {
137	&dev_attr_physical_package_id.attr,
138#ifdef TOPOLOGY_DIE_SYSFS
139	&dev_attr_die_id.attr,
140#endif
141#ifdef TOPOLOGY_CLUSTER_SYSFS
142	&dev_attr_cluster_id.attr,
143#endif
144	&dev_attr_core_id.attr,
145#ifdef TOPOLOGY_BOOK_SYSFS
146	&dev_attr_book_id.attr,
147#endif
148#ifdef TOPOLOGY_DRAWER_SYSFS
149	&dev_attr_drawer_id.attr,
150#endif
151	&dev_attr_ppin.attr,
152	NULL
153};
154
155static umode_t topology_is_visible(struct kobject *kobj,
156				   struct attribute *attr, int unused)
157{
158	if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id))
159		return 0;
160
161	return attr->mode;
162}
163
164static const struct attribute_group topology_attr_group = {
165	.attrs = default_attrs,
166	.bin_attrs = bin_attrs,
167	.is_visible = topology_is_visible,
168	.name = "topology"
169};
170
171/* Add/Remove cpu_topology interface for CPU device */
172static int topology_add_dev(unsigned int cpu)
173{
174	struct device *dev = get_cpu_device(cpu);
175
176	return sysfs_create_group(&dev->kobj, &topology_attr_group);
177}
178
179static int topology_remove_dev(unsigned int cpu)
180{
181	struct device *dev = get_cpu_device(cpu);
182
183	sysfs_remove_group(&dev->kobj, &topology_attr_group);
184	return 0;
185}
186
187static int __init topology_sysfs_init(void)
188{
189	return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
190				 "base/topology:prepare", topology_add_dev,
191				 topology_remove_dev);
192}
193
194device_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, fmt)					\
 18static ssize_t name##_show(struct device *dev,				\
 19			   struct device_attribute *attr, char *buf)	\
 20{									\
 21	return sysfs_emit(buf, fmt "\n", topology_##name(dev->id));	\
 22}
 23
 24#define define_siblings_read_func(name, mask)					\
 25static ssize_t name##_read(struct file *file, struct kobject *kobj,		\
 26			   struct bin_attribute *attr, char *buf,		\
 27			   loff_t off, size_t count)				\
 28{										\
 29	struct device *dev = kobj_to_dev(kobj);                                 \
 30										\
 31	return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id),	\
 32					   off, count);                         \
 33}										\
 34										\
 35static ssize_t name##_list_read(struct file *file, struct kobject *kobj,	\
 36				struct bin_attribute *attr, char *buf,		\
 37				loff_t off, size_t count)			\
 38{										\
 39	struct device *dev = kobj_to_dev(kobj);					\
 40										\
 41	return cpumap_print_list_to_buf(buf, topology_##mask(dev->id),		\
 42					off, count);				\
 43}
 44
 45define_id_show_func(physical_package_id, "%d");
 46static DEVICE_ATTR_RO(physical_package_id);
 47
 48#ifdef TOPOLOGY_DIE_SYSFS
 49define_id_show_func(die_id, "%d");
 50static DEVICE_ATTR_RO(die_id);
 51#endif
 52
 53#ifdef TOPOLOGY_CLUSTER_SYSFS
 54define_id_show_func(cluster_id, "%d");
 55static DEVICE_ATTR_RO(cluster_id);
 56#endif
 57
 58define_id_show_func(core_id, "%d");
 59static DEVICE_ATTR_RO(core_id);
 60
 61define_id_show_func(ppin, "0x%llx");
 62static DEVICE_ATTR_ADMIN_RO(ppin);
 63
 64define_siblings_read_func(thread_siblings, sibling_cpumask);
 65static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
 66static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);
 67
 68define_siblings_read_func(core_cpus, sibling_cpumask);
 69static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
 70static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);
 71
 72define_siblings_read_func(core_siblings, core_cpumask);
 73static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
 74static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);
 75
 76#ifdef TOPOLOGY_CLUSTER_SYSFS
 77define_siblings_read_func(cluster_cpus, cluster_cpumask);
 78static BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES);
 79static BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES);
 80#endif
 81
 82#ifdef TOPOLOGY_DIE_SYSFS
 83define_siblings_read_func(die_cpus, die_cpumask);
 84static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
 85static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
 86#endif
 87
 88define_siblings_read_func(package_cpus, core_cpumask);
 89static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
 90static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);
 91
 92#ifdef TOPOLOGY_BOOK_SYSFS
 93define_id_show_func(book_id, "%d");
 94static DEVICE_ATTR_RO(book_id);
 95define_siblings_read_func(book_siblings, book_cpumask);
 96static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
 97static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
 98#endif
 99
100#ifdef TOPOLOGY_DRAWER_SYSFS
101define_id_show_func(drawer_id, "%d");
102static DEVICE_ATTR_RO(drawer_id);
103define_siblings_read_func(drawer_siblings, drawer_cpumask);
104static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
105static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
106#endif
107
108static struct bin_attribute *bin_attrs[] = {
109	&bin_attr_core_cpus,
110	&bin_attr_core_cpus_list,
111	&bin_attr_thread_siblings,
112	&bin_attr_thread_siblings_list,
113	&bin_attr_core_siblings,
114	&bin_attr_core_siblings_list,
115#ifdef TOPOLOGY_CLUSTER_SYSFS
116	&bin_attr_cluster_cpus,
117	&bin_attr_cluster_cpus_list,
118#endif
119#ifdef TOPOLOGY_DIE_SYSFS
120	&bin_attr_die_cpus,
121	&bin_attr_die_cpus_list,
122#endif
123	&bin_attr_package_cpus,
124	&bin_attr_package_cpus_list,
125#ifdef TOPOLOGY_BOOK_SYSFS
126	&bin_attr_book_siblings,
127	&bin_attr_book_siblings_list,
128#endif
129#ifdef TOPOLOGY_DRAWER_SYSFS
130	&bin_attr_drawer_siblings,
131	&bin_attr_drawer_siblings_list,
132#endif
133	NULL
134};
135
136static struct attribute *default_attrs[] = {
137	&dev_attr_physical_package_id.attr,
138#ifdef TOPOLOGY_DIE_SYSFS
139	&dev_attr_die_id.attr,
140#endif
141#ifdef TOPOLOGY_CLUSTER_SYSFS
142	&dev_attr_cluster_id.attr,
143#endif
144	&dev_attr_core_id.attr,
145#ifdef TOPOLOGY_BOOK_SYSFS
146	&dev_attr_book_id.attr,
147#endif
148#ifdef TOPOLOGY_DRAWER_SYSFS
149	&dev_attr_drawer_id.attr,
150#endif
151	&dev_attr_ppin.attr,
152	NULL
153};
154
155static umode_t topology_is_visible(struct kobject *kobj,
156				   struct attribute *attr, int unused)
157{
158	if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id))
159		return 0;
160
161	return attr->mode;
162}
163
164static const struct attribute_group topology_attr_group = {
165	.attrs = default_attrs,
166	.bin_attrs = bin_attrs,
167	.is_visible = topology_is_visible,
168	.name = "topology"
169};
170
171/* Add/Remove cpu_topology interface for CPU device */
172static int topology_add_dev(unsigned int cpu)
173{
174	struct device *dev = get_cpu_device(cpu);
175
176	return sysfs_create_group(&dev->kobj, &topology_attr_group);
177}
178
179static int topology_remove_dev(unsigned int cpu)
180{
181	struct device *dev = get_cpu_device(cpu);
182
183	sysfs_remove_group(&dev->kobj, &topology_attr_group);
184	return 0;
185}
186
187static int __init topology_sysfs_init(void)
188{
189	return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
190				 "base/topology:prepare", topology_add_dev,
191				 topology_remove_dev);
192}
193
194device_initcall(topology_sysfs_init);