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_read_func(name, mask) \ 25 static 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 \ 35 static 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 45 define_id_show_func(physical_package_id); 46 static DEVICE_ATTR_RO(physical_package_id); 47 48 #ifdef TOPOLOGY_DIE_SYSFS 49 define_id_show_func(die_id); 50 static DEVICE_ATTR_RO(die_id); 51 #endif 52 53 #ifdef TOPOLOGY_CLUSTER_SYSFS 54 define_id_show_func(cluster_id); 55 static DEVICE_ATTR_RO(cluster_id); 56 #endif 57 58 define_id_show_func(core_id); 59 static DEVICE_ATTR_RO(core_id); 60 61 define_siblings_read_func(thread_siblings, sibling_cpumask); 62 static BIN_ATTR_RO(thread_siblings, 0); 63 static BIN_ATTR_RO(thread_siblings_list, 0); 64 65 define_siblings_read_func(core_cpus, sibling_cpumask); 66 static BIN_ATTR_RO(core_cpus, 0); 67 static BIN_ATTR_RO(core_cpus_list, 0); 68 69 define_siblings_read_func(core_siblings, core_cpumask); 70 static BIN_ATTR_RO(core_siblings, 0); 71 static BIN_ATTR_RO(core_siblings_list, 0); 72 73 #ifdef TOPOLOGY_CLUSTER_SYSFS 74 define_siblings_read_func(cluster_cpus, cluster_cpumask); 75 static BIN_ATTR_RO(cluster_cpus, 0); 76 static BIN_ATTR_RO(cluster_cpus_list, 0); 77 #endif 78 79 #ifdef TOPOLOGY_DIE_SYSFS 80 define_siblings_read_func(die_cpus, die_cpumask); 81 static BIN_ATTR_RO(die_cpus, 0); 82 static BIN_ATTR_RO(die_cpus_list, 0); 83 #endif 84 85 define_siblings_read_func(package_cpus, core_cpumask); 86 static BIN_ATTR_RO(package_cpus, 0); 87 static BIN_ATTR_RO(package_cpus_list, 0); 88 89 #ifdef TOPOLOGY_BOOK_SYSFS 90 define_id_show_func(book_id); 91 static DEVICE_ATTR_RO(book_id); 92 define_siblings_read_func(book_siblings, book_cpumask); 93 static BIN_ATTR_RO(book_siblings, 0); 94 static BIN_ATTR_RO(book_siblings_list, 0); 95 #endif 96 97 #ifdef TOPOLOGY_DRAWER_SYSFS 98 define_id_show_func(drawer_id); 99 static DEVICE_ATTR_RO(drawer_id); 100 define_siblings_read_func(drawer_siblings, drawer_cpumask); 101 static BIN_ATTR_RO(drawer_siblings, 0); 102 static BIN_ATTR_RO(drawer_siblings_list, 0); 103 #endif 104 105 static struct bin_attribute *bin_attrs[] = { 106 &bin_attr_core_cpus, 107 &bin_attr_core_cpus_list, 108 &bin_attr_thread_siblings, 109 &bin_attr_thread_siblings_list, 110 &bin_attr_core_siblings, 111 &bin_attr_core_siblings_list, 112 #ifdef TOPOLOGY_CLUSTER_SYSFS 113 &bin_attr_cluster_cpus, 114 &bin_attr_cluster_cpus_list, 115 #endif 116 #ifdef TOPOLOGY_DIE_SYSFS 117 &bin_attr_die_cpus, 118 &bin_attr_die_cpus_list, 119 #endif 120 &bin_attr_package_cpus, 121 &bin_attr_package_cpus_list, 122 #ifdef TOPOLOGY_BOOK_SYSFS 123 &bin_attr_book_siblings, 124 &bin_attr_book_siblings_list, 125 #endif 126 #ifdef TOPOLOGY_DRAWER_SYSFS 127 &bin_attr_drawer_siblings, 128 &bin_attr_drawer_siblings_list, 129 #endif 130 NULL 131 }; 132 133 static struct attribute *default_attrs[] = { 134 &dev_attr_physical_package_id.attr, 135 #ifdef TOPOLOGY_DIE_SYSFS 136 &dev_attr_die_id.attr, 137 #endif 138 #ifdef TOPOLOGY_CLUSTER_SYSFS 139 &dev_attr_cluster_id.attr, 140 #endif 141 &dev_attr_core_id.attr, 142 #ifdef TOPOLOGY_BOOK_SYSFS 143 &dev_attr_book_id.attr, 144 #endif 145 #ifdef TOPOLOGY_DRAWER_SYSFS 146 &dev_attr_drawer_id.attr, 147 #endif 148 NULL 149 }; 150 151 static const struct attribute_group topology_attr_group = { 152 .attrs = default_attrs, 153 .bin_attrs = bin_attrs, 154 .name = "topology" 155 }; 156 157 /* Add/Remove cpu_topology interface for CPU device */ 158 static int topology_add_dev(unsigned int cpu) 159 { 160 struct device *dev = get_cpu_device(cpu); 161 162 return sysfs_create_group(&dev->kobj, &topology_attr_group); 163 } 164 165 static int topology_remove_dev(unsigned int cpu) 166 { 167 struct device *dev = get_cpu_device(cpu); 168 169 sysfs_remove_group(&dev->kobj, &topology_attr_group); 170 return 0; 171 } 172 173 static int __init topology_sysfs_init(void) 174 { 175 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE, 176 "base/topology:prepare", topology_add_dev, 177 topology_remove_dev); 178 } 179 180 device_initcall(topology_sysfs_init); 181