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Zhang, Yanmin69dcc992006-02-03 03:04:36 -08001/*
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 */
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080026#include <linux/init.h>
27#include <linux/mm.h>
28#include <linux/cpu.h>
29#include <linux/module.h>
David Millerb13d3722009-01-07 15:30:05 -080030#include <linux/hardirq.h>
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080031#include <linux/topology.h>
32
Rusty Russellfbd59a82009-01-10 21:58:08 -080033#define define_one_ro_named(_name, _func) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080034 static DEVICE_ATTR(_name, 0444, _func, NULL)
Rusty Russellfbd59a82009-01-10 21:58:08 -080035
36#define define_one_ro(_name) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080037 static DEVICE_ATTR(_name, 0444, show_##_name, NULL)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080038
39#define define_id_show_func(name) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080040static ssize_t show_##name(struct device *dev, \
41 struct device_attribute *attr, char *buf) \
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080042{ \
Vincent Stehléed04ce12014-04-04 08:43:18 +020043 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080044}
45
Heiko Carstensb40d8ed2010-08-31 10:28:17 +020046#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
47 defined(topology_book_cpumask)
Rusty Russellfbd59a82009-01-10 21:58:08 -080048static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
Mike Travis39106dc2008-04-08 11:43:03 -070049{
50 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
51 int n = 0;
52
53 if (len > 1) {
54 n = type?
Rusty Russell29c01772008-12-13 21:20:25 +103055 cpulist_scnprintf(buf, len-2, mask) :
56 cpumask_scnprintf(buf, len-2, mask);
Mike Travis39106dc2008-04-08 11:43:03 -070057 buf[n++] = '\n';
58 buf[n] = '\0';
59 }
60 return n;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080061}
Mike Travis23ca4bb2008-05-12 21:21:12 +020062#endif
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080063
Mike Travis23ca4bb2008-05-12 21:21:12 +020064#ifdef arch_provides_topology_pointers
Mike Travis39106dc2008-04-08 11:43:03 -070065#define define_siblings_show_map(name) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080066static ssize_t show_##name(struct device *dev, \
67 struct device_attribute *attr, char *buf) \
Mike Travis39106dc2008-04-08 11:43:03 -070068{ \
69 unsigned int cpu = dev->id; \
Rusty Russellfbd59a82009-01-10 21:58:08 -080070 return show_cpumap(0, topology_##name(cpu), buf); \
Mike Travis39106dc2008-04-08 11:43:03 -070071}
72
73#define define_siblings_show_list(name) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080074static ssize_t show_##name##_list(struct device *dev, \
75 struct device_attribute *attr, \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020076 char *buf) \
Mike Travis39106dc2008-04-08 11:43:03 -070077{ \
78 unsigned int cpu = dev->id; \
Rusty Russellfbd59a82009-01-10 21:58:08 -080079 return show_cpumap(1, topology_##name(cpu), buf); \
Mike Travis39106dc2008-04-08 11:43:03 -070080}
81
Mike Travis23ca4bb2008-05-12 21:21:12 +020082#else
83#define define_siblings_show_map(name) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080084static ssize_t show_##name(struct device *dev, \
85 struct device_attribute *attr, char *buf) \
Mike Travis23ca4bb2008-05-12 21:21:12 +020086{ \
Rusty Russellfbd59a82009-01-10 21:58:08 -080087 return show_cpumap(0, topology_##name(dev->id), buf); \
Mike Travis23ca4bb2008-05-12 21:21:12 +020088}
89
90#define define_siblings_show_list(name) \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080091static ssize_t show_##name##_list(struct device *dev, \
92 struct device_attribute *attr, \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020093 char *buf) \
Mike Travis23ca4bb2008-05-12 21:21:12 +020094{ \
Rusty Russellfbd59a82009-01-10 21:58:08 -080095 return show_cpumap(1, topology_##name(dev->id), buf); \
Mike Travis23ca4bb2008-05-12 21:21:12 +020096}
97#endif
98
Mike Travis39106dc2008-04-08 11:43:03 -070099#define define_siblings_show_func(name) \
100 define_siblings_show_map(name); define_siblings_show_list(name)
101
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800102define_id_show_func(physical_package_id);
103define_one_ro(physical_package_id);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800104
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800105define_id_show_func(core_id);
106define_one_ro(core_id);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800107
Rusty Russellfbd59a82009-01-10 21:58:08 -0800108define_siblings_show_func(thread_cpumask);
109define_one_ro_named(thread_siblings, show_thread_cpumask);
110define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800111
Rusty Russellfbd59a82009-01-10 21:58:08 -0800112define_siblings_show_func(core_cpumask);
113define_one_ro_named(core_siblings, show_core_cpumask);
114define_one_ro_named(core_siblings_list, show_core_cpumask_list);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800115
Heiko Carstensb40d8ed2010-08-31 10:28:17 +0200116#ifdef CONFIG_SCHED_BOOK
117define_id_show_func(book_id);
118define_one_ro(book_id);
119define_siblings_show_func(book_cpumask);
120define_one_ro_named(book_siblings, show_book_cpumask);
121define_one_ro_named(book_siblings_list, show_book_cpumask_list);
122#endif
123
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800124static struct attribute *default_attrs[] = {
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800125 &dev_attr_physical_package_id.attr,
126 &dev_attr_core_id.attr,
127 &dev_attr_thread_siblings.attr,
128 &dev_attr_thread_siblings_list.attr,
129 &dev_attr_core_siblings.attr,
130 &dev_attr_core_siblings_list.attr,
Heiko Carstensb40d8ed2010-08-31 10:28:17 +0200131#ifdef CONFIG_SCHED_BOOK
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800132 &dev_attr_book_id.attr,
133 &dev_attr_book_siblings.attr,
134 &dev_attr_book_siblings_list.attr,
Heiko Carstensb40d8ed2010-08-31 10:28:17 +0200135#endif
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800136 NULL
137};
138
139static struct attribute_group topology_attr_group = {
140 .attrs = default_attrs,
141 .name = "topology"
142};
143
144/* Add/Remove cpu_topology interface for CPU device */
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800145static int __cpuinit topology_add_dev(unsigned int cpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800146{
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800147 struct device *dev = get_cpu_device(cpu);
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800148
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800149 return sysfs_create_group(&dev->kobj, &topology_attr_group);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800150}
151
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800152static void __cpuinit topology_remove_dev(unsigned int cpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800153{
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800154 struct device *dev = get_cpu_device(cpu);
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800155
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800156 sysfs_remove_group(&dev->kobj, &topology_attr_group);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800157}
158
Chandra Seetharaman9c7b2162006-06-27 02:54:07 -0700159static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800160 unsigned long action, void *hcpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800161{
162 unsigned int cpu = (unsigned long)hcpu;
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800163 int rc = 0;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800164
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800165 switch (action) {
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800166 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700167 case CPU_UP_PREPARE_FROZEN:
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800168 rc = topology_add_dev(cpu);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800169 break;
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800170 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700171 case CPU_UP_CANCELED_FROZEN:
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800172 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700173 case CPU_DEAD_FROZEN:
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800174 topology_remove_dev(cpu);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800175 break;
176 }
Akinobu Mitaad84bb52010-05-26 14:43:31 -0700177 return notifier_from_errno(rc);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800178}
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800179
180static int __cpuinit topology_sysfs_init(void)
181{
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800182 int cpu;
183 int rc;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800184
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800185 for_each_online_cpu(cpu) {
186 rc = topology_add_dev(cpu);
187 if (rc)
188 return rc;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800189 }
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800190 hotcpu_notifier(topology_cpu_callback, 0);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800191
192 return 0;
193}
194
195device_initcall(topology_sysfs_init);