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); 144