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)                                       \
  18 static 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_show_map(name, mask)                            \
  25 static 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)                           \
  32 static 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
  43 define_id_show_func(physical_package_id);
  44 static DEVICE_ATTR_RO(physical_package_id);
  45
  46 define_id_show_func(die_id);
  47 static DEVICE_ATTR_RO(die_id);
  48
  49 define_id_show_func(core_id);
  50 static DEVICE_ATTR_RO(core_id);
  51
  52 define_siblings_show_func(thread_siblings, sibling_cpumask);
  53 static DEVICE_ATTR_RO(thread_siblings);
  54 static DEVICE_ATTR_RO(thread_siblings_list);
  55
  56 define_siblings_show_func(core_cpus, sibling_cpumask);
  57 static DEVICE_ATTR_RO(core_cpus);
  58 static DEVICE_ATTR_RO(core_cpus_list);
  59
  60 define_siblings_show_func(core_siblings, core_cpumask);
  61 static DEVICE_ATTR_RO(core_siblings);
  62 static DEVICE_ATTR_RO(core_siblings_list);
  63
  64 define_siblings_show_func(die_cpus, die_cpumask);
  65 static DEVICE_ATTR_RO(die_cpus);
  66 static DEVICE_ATTR_RO(die_cpus_list);
  67
  68 define_siblings_show_func(package_cpus, core_cpumask);
  69 static DEVICE_ATTR_RO(package_cpus);
  70 static DEVICE_ATTR_RO(package_cpus_list);
  71
  72 #ifdef CONFIG_SCHED_BOOK
  73 define_id_show_func(book_id);
  74 static DEVICE_ATTR_RO(book_id);
  75 define_siblings_show_func(book_siblings, book_cpumask);
  76 static DEVICE_ATTR_RO(book_siblings);
  77 static DEVICE_ATTR_RO(book_siblings_list);
  78 #endif
  79
  80 #ifdef CONFIG_SCHED_DRAWER
  81 define_id_show_func(drawer_id);
  82 static DEVICE_ATTR_RO(drawer_id);
  83 define_siblings_show_func(drawer_siblings, drawer_cpumask);
  84 static DEVICE_ATTR_RO(drawer_siblings);
  85 static DEVICE_ATTR_RO(drawer_siblings_list);
  86 #endif
  87
  88 static 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
 115 static 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 */
 121 static 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
 128 static 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
 136 static 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
 143 device_initcall(topology_sysfs_init);