LXR linux/drivers/base/topology.c

   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 sysfs_emit(buf, "%d\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);
  46static DEVICE_ATTR_RO(physical_package_id);
  47
  48define_id_show_func(die_id);
  49static DEVICE_ATTR_RO(die_id);
  50
  51define_id_show_func(core_id);
  52static DEVICE_ATTR_RO(core_id);
  53
  54define_siblings_read_func(thread_siblings, sibling_cpumask);
  55static BIN_ATTR_RO(thread_siblings, 0);
  56static BIN_ATTR_RO(thread_siblings_list, 0);
  57
  58define_siblings_read_func(core_cpus, sibling_cpumask);
  59static BIN_ATTR_RO(core_cpus, 0);
  60static BIN_ATTR_RO(core_cpus_list, 0);
  61
  62define_siblings_read_func(core_siblings, core_cpumask);
  63static BIN_ATTR_RO(core_siblings, 0);
  64static BIN_ATTR_RO(core_siblings_list, 0);
  65
  66define_siblings_read_func(die_cpus, die_cpumask);
  67static BIN_ATTR_RO(die_cpus, 0);
  68static BIN_ATTR_RO(die_cpus_list, 0);
  69
  70define_siblings_read_func(package_cpus, core_cpumask);
  71static BIN_ATTR_RO(package_cpus, 0);
  72static BIN_ATTR_RO(package_cpus_list, 0);
  73
  74#ifdef CONFIG_SCHED_BOOK
  75define_id_show_func(book_id);
  76static DEVICE_ATTR_RO(book_id);
  77define_siblings_read_func(book_siblings, book_cpumask);
  78static BIN_ATTR_RO(book_siblings, 0);
  79static BIN_ATTR_RO(book_siblings_list, 0);
  80#endif
  81
  82#ifdef CONFIG_SCHED_DRAWER
  83define_id_show_func(drawer_id);
  84static DEVICE_ATTR_RO(drawer_id);
  85define_siblings_read_func(drawer_siblings, drawer_cpumask);
  86static BIN_ATTR_RO(drawer_siblings, 0);
  87static BIN_ATTR_RO(drawer_siblings_list, 0);
  88#endif
  89
  90static struct bin_attribute *bin_attrs[] = {
  91        &bin_attr_core_cpus,
  92        &bin_attr_core_cpus_list,
  93        &bin_attr_thread_siblings,
  94        &bin_attr_thread_siblings_list,
  95        &bin_attr_core_siblings,
  96        &bin_attr_core_siblings_list,
  97        &bin_attr_die_cpus,
  98        &bin_attr_die_cpus_list,
  99        &bin_attr_package_cpus,
 100        &bin_attr_package_cpus_list,
 101#ifdef CONFIG_SCHED_BOOK
 102        &bin_attr_book_siblings,
 103        &bin_attr_book_siblings_list,
 104#endif
 105#ifdef CONFIG_SCHED_DRAWER
 106        &bin_attr_drawer_siblings,
 107        &bin_attr_drawer_siblings_list,
 108#endif
 109        NULL
 110};
 111
 112static struct attribute *default_attrs[] = {
 113        &dev_attr_physical_package_id.attr,
 114        &dev_attr_die_id.attr,
 115        &dev_attr_core_id.attr,
 116#ifdef CONFIG_SCHED_BOOK
 117        &dev_attr_book_id.attr,
 118#endif
 119#ifdef CONFIG_SCHED_DRAWER
 120        &dev_attr_drawer_id.attr,
 121#endif
 122        NULL
 123};
 124
 125static const struct attribute_group topology_attr_group = {
 126        .attrs = default_attrs,
 127        .bin_attrs = bin_attrs,
 128        .name = "topology"
 129};
 130
 131/* Add/Remove cpu_topology interface for CPU device */
 132static int topology_add_dev(unsigned int cpu)
 133{
 134        struct device *dev = get_cpu_device(cpu);
 135
 136        return sysfs_create_group(&dev->kobj, &topology_attr_group);
 137}
 138
 139static int topology_remove_dev(unsigned int cpu)
 140{
 141        struct device *dev = get_cpu_device(cpu);
 142
 143        sysfs_remove_group(&dev->kobj, &topology_attr_group);
 144        return 0;
 145}
 146
 147static int __init topology_sysfs_init(void)
 148{
 149        return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
 150                                 "base/topology:prepare", topology_add_dev,
 151                                 topology_remove_dev);
 152}
 153
 154device_initcall(topology_sysfs_init);
 155