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