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 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);
 144