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 | |
| 43 | #define define_siblings_show_func(name) \ |
| 44 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ |
| 45 | { \ |
| 46 | ssize_t len = -1; \ |
| 47 | unsigned int cpu = dev->id; \ |
| 48 | len = cpumask_scnprintf(buf, NR_CPUS+1, topology_##name(cpu)); \ |
| 49 | return (len + sprintf(buf + len, "\n")); \ |
| 50 | } |
| 51 | |
| 52 | #ifdef topology_physical_package_id |
| 53 | define_id_show_func(physical_package_id); |
| 54 | define_one_ro(physical_package_id); |
| 55 | #define ref_physical_package_id_attr &attr_physical_package_id.attr, |
| 56 | #else |
| 57 | #define ref_physical_package_id_attr |
| 58 | #endif |
| 59 | |
| 60 | #ifdef topology_core_id |
| 61 | define_id_show_func(core_id); |
| 62 | define_one_ro(core_id); |
| 63 | #define ref_core_id_attr &attr_core_id.attr, |
| 64 | #else |
| 65 | #define ref_core_id_attr |
| 66 | #endif |
| 67 | |
| 68 | #ifdef topology_thread_siblings |
| 69 | define_siblings_show_func(thread_siblings); |
| 70 | define_one_ro(thread_siblings); |
| 71 | #define ref_thread_siblings_attr &attr_thread_siblings.attr, |
| 72 | #else |
| 73 | #define ref_thread_siblings_attr |
| 74 | #endif |
| 75 | |
| 76 | #ifdef topology_core_siblings |
| 77 | define_siblings_show_func(core_siblings); |
| 78 | define_one_ro(core_siblings); |
| 79 | #define ref_core_siblings_attr &attr_core_siblings.attr, |
| 80 | #else |
| 81 | #define ref_core_siblings_attr |
| 82 | #endif |
| 83 | |
| 84 | static struct attribute *default_attrs[] = { |
| 85 | ref_physical_package_id_attr |
| 86 | ref_core_id_attr |
| 87 | ref_thread_siblings_attr |
| 88 | ref_core_siblings_attr |
| 89 | NULL |
| 90 | }; |
| 91 | |
| 92 | static struct attribute_group topology_attr_group = { |
| 93 | .attrs = default_attrs, |
| 94 | .name = "topology" |
| 95 | }; |
| 96 | |
| 97 | /* Add/Remove cpu_topology interface for CPU device */ |
| 98 | static int __cpuinit topology_add_dev(struct sys_device * sys_dev) |
| 99 | { |
Cornelia Huck | 221c324 | 2006-09-22 11:37:32 +0200 | [diff] [blame] | 100 | return sysfs_create_group(&sys_dev->kobj, &topology_attr_group); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | static int __cpuinit topology_remove_dev(struct sys_device * sys_dev) |
| 104 | { |
| 105 | sysfs_remove_group(&sys_dev->kobj, &topology_attr_group); |
| 106 | return 0; |
| 107 | } |
| 108 | |
Chandra Seetharaman | 9c7b216 | 2006-06-27 02:54:07 -0700 | [diff] [blame] | 109 | static int __cpuinit topology_cpu_callback(struct notifier_block *nfb, |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 110 | unsigned long action, void *hcpu) |
| 111 | { |
| 112 | unsigned int cpu = (unsigned long)hcpu; |
| 113 | struct sys_device *sys_dev; |
| 114 | |
| 115 | sys_dev = get_cpu_sysdev(cpu); |
| 116 | switch (action) { |
| 117 | case CPU_ONLINE: |
| 118 | topology_add_dev(sys_dev); |
| 119 | break; |
| 120 | case CPU_DEAD: |
| 121 | topology_remove_dev(sys_dev); |
| 122 | break; |
| 123 | } |
| 124 | return NOTIFY_OK; |
| 125 | } |
| 126 | |
Chandra Seetharaman | 74b85f3 | 2006-06-27 02:54:09 -0700 | [diff] [blame] | 127 | static struct notifier_block __cpuinitdata topology_cpu_notifier = |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 128 | { |
| 129 | .notifier_call = topology_cpu_callback, |
| 130 | }; |
| 131 | |
| 132 | static int __cpuinit topology_sysfs_init(void) |
| 133 | { |
| 134 | int i; |
| 135 | |
| 136 | for_each_online_cpu(i) { |
| 137 | topology_cpu_callback(&topology_cpu_notifier, CPU_ONLINE, |
| 138 | (void *)(long)i); |
| 139 | } |
| 140 | |
Chandra Seetharaman | be6b5a3 | 2006-07-30 03:03:37 -0700 | [diff] [blame] | 141 | register_hotcpu_notifier(&topology_cpu_notifier); |
Zhang, Yanmin | 69dcc99 | 2006-02-03 03:04:36 -0800 | [diff] [blame] | 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | device_initcall(topology_sysfs_init); |
| 147 | |