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 sprintf(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(core_id); 47 static DEVICE_ATTR_RO(core_id); 48 49 define_siblings_show_func(thread_siblings, sibling_cpumask); 50 static DEVICE_ATTR_RO(thread_siblings); 51 static DEVICE_ATTR_RO(thread_siblings_list); 52 53 define_siblings_show_func(core_siblings, core_cpumask); 54 static DEVICE_ATTR_RO(core_siblings); 55 static DEVICE_ATTR_RO(core_siblings_list); 56 57 #ifdef CONFIG_SCHED_BOOK 58 define_id_show_func(book_id); 59 static DEVICE_ATTR_RO(book_id); 60 define_siblings_show_func(book_siblings, book_cpumask); 61 static DEVICE_ATTR_RO(book_siblings); 62 static DEVICE_ATTR_RO(book_siblings_list); 63 #endif 64 65 #ifdef CONFIG_SCHED_DRAWER 66 define_id_show_func(drawer_id); 67 static DEVICE_ATTR_RO(drawer_id); 68 define_siblings_show_func(drawer_siblings, drawer_cpumask); 69 static DEVICE_ATTR_RO(drawer_siblings); 70 static DEVICE_ATTR_RO(drawer_siblings_list); 71 #endif 72 73 static struct attribute *default_attrs[] = { 74 &dev_attr_physical_package_id.attr, 75 &dev_attr_core_id.attr, 76 &dev_attr_thread_siblings.attr, 77 &dev_attr_thread_siblings_list.attr, 78 &dev_attr_core_siblings.attr, 79 &dev_attr_core_siblings_list.attr, 80 #ifdef CONFIG_SCHED_BOOK 81 &dev_attr_book_id.attr, 82 &dev_attr_book_siblings.attr, 83 &dev_attr_book_siblings_list.attr, 84 #endif 85 #ifdef CONFIG_SCHED_DRAWER 86 &dev_attr_drawer_id.attr, 87 &dev_attr_drawer_siblings.attr, 88 &dev_attr_drawer_siblings_list.attr, 89 #endif 90 NULL 91 }; 92 93 static const struct attribute_group topology_attr_group = { 94 .attrs = default_attrs, 95 .name = "topology" 96 }; 97 98 /* Add/Remove cpu_topology interface for CPU device */ 99 static int topology_add_dev(unsigned int cpu) 100 { 101 struct device *dev = get_cpu_device(cpu); 102 103 return sysfs_create_group(&dev->kobj, &topology_attr_group); 104 } 105 106 static int topology_remove_dev(unsigned int cpu) 107 { 108 struct device *dev = get_cpu_device(cpu); 109 110 sysfs_remove_group(&dev->kobj, &topology_attr_group); 111 return 0; 112 } 113 114 static int topology_sysfs_init(void) 115 { 116 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE, 117 "base/topology:prepare", topology_add_dev, 118 topology_remove_dev); 119 } 120 121 device_initcall(topology_sysfs_init); 122