Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * driver/base/topology.c - Populate sysfs with cpu topology information |
| 3 | * |
| 4 | * Written by: Zhang Yanmin, Intel Corporation |
| 5 | * |
| 6 | * Copyright (C) 2006, Intel Corp. |
| 7 | * |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 18 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 19 | * details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | * |
| 25 | */ |
| 26 | #include <linux/sysdev.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/cpu.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/topology.h> |
| 32 | |
| 33 | #define define_one_ro(_name) \ |
| 34 | static SYSDEV_ATTR(_name, 0444, show_##_name, NULL) |
| 35 | |
| 36 | #define define_id_show_func(name) \ |
| 37 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ |
| 38 | { \ |
| 39 | unsigned int cpu = dev->id; \ |
| 40 | return sprintf(buf, "%d\n", topology_##name(cpu)); \ |
| 41 | } |
| 42 | |
Mike Travis | 23ca4bb | 2008-05-12 21:21:12 +0200 | [diff] [blame^] | 43 | #if defined(topology_thread_siblings) || defined(topology_core_siblings) |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 44 | static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf) |
| 45 | { |
| 46 | ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf; |
| 47 | int n = 0; |
| 48 | |
| 49 | if (len > 1) { |
| 50 | n = type? |
| 51 | cpulist_scnprintf(buf, len-2, *mask): |
| 52 | cpumask_scnprintf(buf, len-2, *mask); |
| 53 | buf[n++] = '\n'; |
| 54 | buf[n] = '\0'; |
| 55 | } |
| 56 | return n; |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 57 | } |
Mike Travis | 23ca4bb | 2008-05-12 21:21:12 +0200 | [diff] [blame^] | 58 | #endif |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 59 | |
Mike Travis | 23ca4bb | 2008-05-12 21:21:12 +0200 | [diff] [blame^] | 60 | #ifdef arch_provides_topology_pointers |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 61 | #define define_siblings_show_map(name) \ |
Mike Travis | 23ca4bb | 2008-05-12 21:21:12 +0200 | [diff] [blame^] | 62 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 63 | { \ |
| 64 | unsigned int cpu = dev->id; \ |
| 65 | return show_cpumap(0, &(topology_##name(cpu)), buf); \ |
| 66 | } |
| 67 | |
| 68 | #define define_siblings_show_list(name) \ |
Mike Travis | 23ca4bb | 2008-05-12 21:21:12 +0200 | [diff] [blame^] | 69 | static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \ |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 70 | { \ |
| 71 | unsigned int cpu = dev->id; \ |
| 72 | return show_cpumap(1, &(topology_##name(cpu)), buf); \ |
| 73 | } |
| 74 | |
Mike Travis | 23ca4bb | 2008-05-12 21:21:12 +0200 | [diff] [blame^] | 75 | #else |
| 76 | #define define_siblings_show_map(name) \ |
| 77 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ |
| 78 | { \ |
| 79 | unsigned int cpu = dev->id; \ |
| 80 | cpumask_t mask = topology_##name(cpu); \ |
| 81 | return show_cpumap(0, &mask, buf); \ |
| 82 | } |
| 83 | |
| 84 | #define define_siblings_show_list(name) \ |
| 85 | static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \ |
| 86 | { \ |
| 87 | unsigned int cpu = dev->id; \ |
| 88 | cpumask_t mask = topology_##name(cpu); \ |
| 89 | return show_cpumap(1, &mask, buf); \ |
| 90 | } |
| 91 | #endif |
| 92 | |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 93 | #define define_siblings_show_func(name) \ |
| 94 | define_siblings_show_map(name); define_siblings_show_list(name) |
| 95 | |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 96 | #ifdef topology_physical_package_id |
| 97 | define_id_show_func(physical_package_id); |
| 98 | define_one_ro(physical_package_id); |
| 99 | #define ref_physical_package_id_attr &attr_physical_package_id.attr, |
| 100 | #else |
| 101 | #define ref_physical_package_id_attr |
| 102 | #endif |
| 103 | |
| 104 | #ifdef topology_core_id |
| 105 | define_id_show_func(core_id); |
| 106 | define_one_ro(core_id); |
| 107 | #define ref_core_id_attr &attr_core_id.attr, |
| 108 | #else |
| 109 | #define ref_core_id_attr |
| 110 | #endif |
| 111 | |
| 112 | #ifdef topology_thread_siblings |
| 113 | define_siblings_show_func(thread_siblings); |
| 114 | define_one_ro(thread_siblings); |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 115 | define_one_ro(thread_siblings_list); |
| 116 | #define ref_thread_siblings_attr \ |
| 117 | &attr_thread_siblings.attr, &attr_thread_siblings_list.attr, |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 118 | #else |
| 119 | #define ref_thread_siblings_attr |
| 120 | #endif |
| 121 | |
| 122 | #ifdef topology_core_siblings |
| 123 | define_siblings_show_func(core_siblings); |
| 124 | define_one_ro(core_siblings); |
Mike Travis | 39106dc | 2008-04-08 11:43:03 -0700 | [diff] [blame] | 125 | define_one_ro(core_siblings_list); |
| 126 | #define ref_core_siblings_attr \ |
| 127 | &attr_core_siblings.attr, &attr_core_siblings_list.attr, |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 128 | #else |
| 129 | #define ref_core_siblings_attr |
| 130 | #endif |
| 131 | |
| 132 | static struct attribute *default_attrs[] = { |
| 133 | ref_physical_package_id_attr |
| 134 | ref_core_id_attr |
| 135 | ref_thread_siblings_attr |
| 136 | ref_core_siblings_attr |
| 137 | NULL |
| 138 | }; |
| 139 | |
| 140 | static struct attribute_group topology_attr_group = { |
| 141 | .attrs = default_attrs, |
| 142 | .name = "topology" |
| 143 | }; |
| 144 | |
| 145 | /* Add/Remove cpu_topology interface for CPU device */ |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 146 | static int __cpuinit topology_add_dev(unsigned int cpu) |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 147 | { |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 148 | struct sys_device *sys_dev = get_cpu_sysdev(cpu); |
| 149 | |
Akinobu Mita | 9780e3e | 2007-10-18 03:05:12 -0700 | [diff] [blame] | 150 | return sysfs_create_group(&sys_dev->kobj, &topology_attr_group); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 151 | } |
| 152 | |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 153 | static void __cpuinit topology_remove_dev(unsigned int cpu) |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 154 | { |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 155 | struct sys_device *sys_dev = get_cpu_sysdev(cpu); |
| 156 | |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 157 | sysfs_remove_group(&sys_dev->kobj, &topology_attr_group); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 158 | } |
| 159 | |
Chandra Seetharaman | 9c7b216 | 2006-06-27 02:54:07 -0700 | [diff] [blame] | 160 | static int __cpuinit topology_cpu_callback(struct notifier_block *nfb, |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 161 | unsigned long action, void *hcpu) |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 162 | { |
| 163 | unsigned int cpu = (unsigned long)hcpu; |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 164 | int rc = 0; |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 165 | |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 166 | switch (action) { |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 167 | case CPU_UP_PREPARE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 168 | case CPU_UP_PREPARE_FROZEN: |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 169 | rc = topology_add_dev(cpu); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 170 | break; |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 171 | case CPU_UP_CANCELED: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 172 | case CPU_UP_CANCELED_FROZEN: |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 173 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 174 | case CPU_DEAD_FROZEN: |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 175 | topology_remove_dev(cpu); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 176 | break; |
| 177 | } |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 178 | return rc ? NOTIFY_BAD : NOTIFY_OK; |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 179 | } |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 180 | |
| 181 | static int __cpuinit topology_sysfs_init(void) |
| 182 | { |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 183 | int cpu; |
| 184 | int rc; |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 185 | |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 186 | for_each_online_cpu(cpu) { |
| 187 | rc = topology_add_dev(cpu); |
| 188 | if (rc) |
| 189 | return rc; |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 190 | } |
Heiko Carstens | 06a4bca | 2006-11-08 19:46:09 -0800 | [diff] [blame] | 191 | hotcpu_notifier(topology_cpu_callback, 0); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | device_initcall(topology_sysfs_init); |