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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | /* * driver/base/topology.c - Populate sysfs with cpu topology information * * Written by: Zhang Yanmin, Intel Corporation * * Copyright (C) 2006, Intel Corp. * * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <linux/mm.h> #include <linux/cpu.h> #include <linux/module.h> #include <linux/hardirq.h> #include <linux/topology.h> #define define_id_show_func(name) \ static ssize_t name##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ return sprintf(buf, "%d\n", topology_##name(dev->id)); \ } #define define_siblings_show_map(name, mask) \ static ssize_t name##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\ } #define define_siblings_show_list(name, mask) \ static ssize_t name##_list_show(struct device *dev, \ struct device_attribute *attr, \ char *buf) \ { \ return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\ } #define define_siblings_show_func(name, mask) \ define_siblings_show_map(name, mask); \ define_siblings_show_list(name, mask) define_id_show_func(physical_package_id); static DEVICE_ATTR_RO(physical_package_id); define_id_show_func(core_id); static DEVICE_ATTR_RO(core_id); define_siblings_show_func(thread_siblings, sibling_cpumask); static DEVICE_ATTR_RO(thread_siblings); static DEVICE_ATTR_RO(thread_siblings_list); define_siblings_show_func(core_siblings, core_cpumask); static DEVICE_ATTR_RO(core_siblings); static DEVICE_ATTR_RO(core_siblings_list); #ifdef CONFIG_SCHED_BOOK define_id_show_func(book_id); static DEVICE_ATTR_RO(book_id); define_siblings_show_func(book_siblings, book_cpumask); static DEVICE_ATTR_RO(book_siblings); static DEVICE_ATTR_RO(book_siblings_list); #endif static struct attribute *default_attrs[] = { &dev_attr_physical_package_id.attr, &dev_attr_core_id.attr, &dev_attr_thread_siblings.attr, &dev_attr_thread_siblings_list.attr, &dev_attr_core_siblings.attr, &dev_attr_core_siblings_list.attr, #ifdef CONFIG_SCHED_BOOK &dev_attr_book_id.attr, &dev_attr_book_siblings.attr, &dev_attr_book_siblings_list.attr, #endif NULL }; static struct attribute_group topology_attr_group = { .attrs = default_attrs, .name = "topology" }; /* Add/Remove cpu_topology interface for CPU device */ static int topology_add_dev(unsigned int cpu) { struct device *dev = get_cpu_device(cpu); return sysfs_create_group(&dev->kobj, &topology_attr_group); } static void topology_remove_dev(unsigned int cpu) { struct device *dev = get_cpu_device(cpu); sysfs_remove_group(&dev->kobj, &topology_attr_group); } static int topology_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { unsigned int cpu = (unsigned long)hcpu; int rc = 0; switch (action) { case CPU_UP_PREPARE: case CPU_UP_PREPARE_FROZEN: rc = topology_add_dev(cpu); break; case CPU_UP_CANCELED: case CPU_UP_CANCELED_FROZEN: case CPU_DEAD: case CPU_DEAD_FROZEN: topology_remove_dev(cpu); break; } return notifier_from_errno(rc); } static int topology_sysfs_init(void) { int cpu; int rc = 0; cpu_notifier_register_begin(); for_each_online_cpu(cpu) { rc = topology_add_dev(cpu); if (rc) goto out; } __hotcpu_notifier(topology_cpu_callback, 0); out: cpu_notifier_register_done(); return rc; } device_initcall(topology_sysfs_init); |