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, fmt) \ 18 static ssize_t name##_show(struct device *dev, \ 19 struct device_attribute *attr, char *buf) \ 20 { \ 21 return sysfs_emit(buf, fmt "\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, "%d"); 46 static DEVICE_ATTR_RO(physical_package_id); 47 48 #ifdef TOPOLOGY_DIE_SYSFS 49 define_id_show_func(die_id, "%d"); 50 static DEVICE_ATTR_RO(die_id); 51 #endif 52 53 #ifdef TOPOLOGY_CLUSTER_SYSFS 54 define_id_show_func(cluster_id, "%d"); 55 static DEVICE_ATTR_RO(cluster_id); 56 #endif 57 58 define_id_show_func(core_id, "%d"); 59 static DEVICE_ATTR_RO(core_id); 60 61 define_id_show_func(ppin, "0x%llx"); 62 static DEVICE_ATTR_ADMIN_RO(ppin); 63 64 define_siblings_read_func(thread_siblings, sibling_cpumask); 65 static BIN_ATTR_RO(thread_siblings, 0); 66 static BIN_ATTR_RO(thread_siblings_list, 0); 67 68 define_siblings_read_func(core_cpus, sibling_cpumask); 69 static BIN_ATTR_RO(core_cpus, 0); 70 static BIN_ATTR_RO(core_cpus_list, 0); 71 72 define_siblings_read_func(core_siblings, core_cpumask); 73 static BIN_ATTR_RO(core_siblings, 0); 74 static BIN_ATTR_RO(core_siblings_list, 0); 75 76 #ifdef TOPOLOGY_CLUSTER_SYSFS 77 define_siblings_read_func(cluster_cpus, cluster_cpumask); 78 static BIN_ATTR_RO(cluster_cpus, 0); 79 static BIN_ATTR_RO(cluster_cpus_list, 0); 80 #endif 81 82 #ifdef TOPOLOGY_DIE_SYSFS 83 define_siblings_read_func(die_cpus, die_cpumask); 84 static BIN_ATTR_RO(die_cpus, 0); 85 static BIN_ATTR_RO(die_cpus_list, 0); 86 #endif 87 88 define_siblings_read_func(package_cpus, core_cpumask); 89 static BIN_ATTR_RO(package_cpus, 0); 90 static BIN_ATTR_RO(package_cpus_list, 0); 91 92 #ifdef TOPOLOGY_BOOK_SYSFS 93 define_id_show_func(book_id, "%d"); 94 static DEVICE_ATTR_RO(book_id); 95 define_siblings_read_func(book_siblings, book_cpumask); 96 static BIN_ATTR_RO(book_siblings, 0); 97 static BIN_ATTR_RO(book_siblings_list, 0); 98 #endif 99 100 #ifdef TOPOLOGY_DRAWER_SYSFS 101 define_id_show_func(drawer_id, "%d"); 102 static DEVICE_ATTR_RO(drawer_id); 103 define_siblings_read_func(drawer_siblings, drawer_cpumask); 104 static BIN_ATTR_RO(drawer_siblings, 0); 105 static BIN_ATTR_RO(drawer_siblings_list, 0); 106 #endif 107 108 static struct bin_attribute *bin_attrs[] = { 109 &bin_attr_core_cpus, 110 &bin_attr_core_cpus_list, 111 &bin_attr_thread_siblings, 112 &bin_attr_thread_siblings_list, 113 &bin_attr_core_siblings, 114 &bin_attr_core_siblings_list, 115 #ifdef TOPOLOGY_CLUSTER_SYSFS 116 &bin_attr_cluster_cpus, 117 &bin_attr_cluster_cpus_list, 118 #endif 119 #ifdef TOPOLOGY_DIE_SYSFS 120 &bin_attr_die_cpus, 121 &bin_attr_die_cpus_list, 122 #endif 123 &bin_attr_package_cpus, 124 &bin_attr_package_cpus_list, 125 #ifdef TOPOLOGY_BOOK_SYSFS 126 &bin_attr_book_siblings, 127 &bin_attr_book_siblings_list, 128 #endif 129 #ifdef TOPOLOGY_DRAWER_SYSFS 130 &bin_attr_drawer_siblings, 131 &bin_attr_drawer_siblings_list, 132 #endif 133 NULL 134 }; 135 136 static struct attribute *default_attrs[] = { 137 &dev_attr_physical_package_id.attr, 138 #ifdef TOPOLOGY_DIE_SYSFS 139 &dev_attr_die_id.attr, 140 #endif 141 #ifdef TOPOLOGY_CLUSTER_SYSFS 142 &dev_attr_cluster_id.attr, 143 #endif 144 &dev_attr_core_id.attr, 145 #ifdef TOPOLOGY_BOOK_SYSFS 146 &dev_attr_book_id.attr, 147 #endif 148 #ifdef TOPOLOGY_DRAWER_SYSFS 149 &dev_attr_drawer_id.attr, 150 #endif 151 &dev_attr_ppin.attr, 152 NULL 153 }; 154 155 static umode_t topology_is_visible(struct kobject *kobj, 156 struct attribute *attr, int unused) 157 { 158 if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id)) 159 return 0; 160 161 return attr->mode; 162 } 163 164 static const struct attribute_group topology_attr_group = { 165 .attrs = default_attrs, 166 .bin_attrs = bin_attrs, 167 .is_visible = topology_is_visible, 168 .name = "topology" 169 }; 170 171 /* Add/Remove cpu_topology interface for CPU device */ 172 static int topology_add_dev(unsigned int cpu) 173 { 174 struct device *dev = get_cpu_device(cpu); 175 176 return sysfs_create_group(&dev->kobj, &topology_attr_group); 177 } 178 179 static int topology_remove_dev(unsigned int cpu) 180 { 181 struct device *dev = get_cpu_device(cpu); 182 183 sysfs_remove_group(&dev->kobj, &topology_attr_group); 184 return 0; 185 } 186 187 static int __init topology_sysfs_init(void) 188 { 189 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE, 190 "base/topology:prepare", topology_add_dev, 191 topology_remove_dev); 192 } 193 194 device_initcall(topology_sysfs_init); 195