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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 */
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>
David Millerb13d3722009-01-07 15:30:05 -080031#include <linux/hardirq.h>
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080032#include <linux/topology.h>
33
Rusty Russellfbd59a82009-01-10 21:58:08 -080034#define define_one_ro_named(_name, _func) \
35static SYSDEV_ATTR(_name, 0444, _func, NULL)
36
37#define define_one_ro(_name) \
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080038static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
39
40#define define_id_show_func(name) \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020041static ssize_t show_##name(struct sys_device *dev, \
42 struct sysdev_attribute *attr, char *buf) \
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080043{ \
44 unsigned int cpu = dev->id; \
45 return sprintf(buf, "%d\n", topology_##name(cpu)); \
46}
47
Rusty Russellfbd59a82009-01-10 21:58:08 -080048#if defined(topology_thread_cpumask) || defined(topology_core_cpumask)
49static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
Mike Travis39106dc2008-04-08 11:43:03 -070050{
51 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
52 int n = 0;
53
54 if (len > 1) {
55 n = type?
Rusty Russell29c01772008-12-13 21:20:25 +103056 cpulist_scnprintf(buf, len-2, mask) :
57 cpumask_scnprintf(buf, len-2, mask);
Mike Travis39106dc2008-04-08 11:43:03 -070058 buf[n++] = '\n';
59 buf[n] = '\0';
60 }
61 return n;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080062}
Mike Travis23ca4bb2008-05-12 21:21:12 +020063#endif
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080064
Mike Travis23ca4bb2008-05-12 21:21:12 +020065#ifdef arch_provides_topology_pointers
Mike Travis39106dc2008-04-08 11:43:03 -070066#define define_siblings_show_map(name) \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020067static ssize_t show_##name(struct sys_device *dev, \
68 struct sysdev_attribute *attr, char *buf) \
Mike Travis39106dc2008-04-08 11:43:03 -070069{ \
70 unsigned int cpu = dev->id; \
Rusty Russellfbd59a82009-01-10 21:58:08 -080071 return show_cpumap(0, topology_##name(cpu), buf); \
Mike Travis39106dc2008-04-08 11:43:03 -070072}
73
74#define define_siblings_show_list(name) \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020075static ssize_t show_##name##_list(struct sys_device *dev, \
76 struct sysdev_attribute *attr, \
77 char *buf) \
Mike Travis39106dc2008-04-08 11:43:03 -070078{ \
79 unsigned int cpu = dev->id; \
Rusty Russellfbd59a82009-01-10 21:58:08 -080080 return show_cpumap(1, topology_##name(cpu), buf); \
Mike Travis39106dc2008-04-08 11:43:03 -070081}
82
Mike Travis23ca4bb2008-05-12 21:21:12 +020083#else
84#define define_siblings_show_map(name) \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020085static ssize_t show_##name(struct sys_device *dev, \
86 struct sysdev_attribute *attr, char *buf) \
Mike Travis23ca4bb2008-05-12 21:21:12 +020087{ \
Rusty Russellfbd59a82009-01-10 21:58:08 -080088 return show_cpumap(0, topology_##name(dev->id), buf); \
Mike Travis23ca4bb2008-05-12 21:21:12 +020089}
90
91#define define_siblings_show_list(name) \
Andi Kleen4a0b2b42008-07-01 18:48:41 +020092static ssize_t show_##name##_list(struct sys_device *dev, \
93 struct sysdev_attribute *attr, \
94 char *buf) \
Mike Travis23ca4bb2008-05-12 21:21:12 +020095{ \
Rusty Russellfbd59a82009-01-10 21:58:08 -080096 return show_cpumap(1, topology_##name(dev->id), buf); \
Mike Travis23ca4bb2008-05-12 21:21:12 +020097}
98#endif
99
Mike Travis39106dc2008-04-08 11:43:03 -0700100#define define_siblings_show_func(name) \
101 define_siblings_show_map(name); define_siblings_show_list(name)
102
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800103define_id_show_func(physical_package_id);
104define_one_ro(physical_package_id);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800105
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800106define_id_show_func(core_id);
107define_one_ro(core_id);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800108
Rusty Russellfbd59a82009-01-10 21:58:08 -0800109define_siblings_show_func(thread_cpumask);
110define_one_ro_named(thread_siblings, show_thread_cpumask);
111define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800112
Rusty Russellfbd59a82009-01-10 21:58:08 -0800113define_siblings_show_func(core_cpumask);
114define_one_ro_named(core_siblings, show_core_cpumask);
115define_one_ro_named(core_siblings_list, show_core_cpumask_list);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800116
117static struct attribute *default_attrs[] = {
Ben Hutchingsc50cbb02008-06-04 21:47:29 -0700118 &attr_physical_package_id.attr,
119 &attr_core_id.attr,
120 &attr_thread_siblings.attr,
121 &attr_thread_siblings_list.attr,
122 &attr_core_siblings.attr,
123 &attr_core_siblings_list.attr,
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800124 NULL
125};
126
127static struct attribute_group topology_attr_group = {
128 .attrs = default_attrs,
129 .name = "topology"
130};
131
132/* Add/Remove cpu_topology interface for CPU device */
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800133static int __cpuinit topology_add_dev(unsigned int cpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800134{
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800135 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
136
Akinobu Mita9780e3e2007-10-18 03:05:12 -0700137 return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800138}
139
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800140static void __cpuinit topology_remove_dev(unsigned int cpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800141{
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800142 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
143
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800144 sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800145}
146
Chandra Seetharaman9c7b2162006-06-27 02:54:07 -0700147static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800148 unsigned long action, void *hcpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800149{
150 unsigned int cpu = (unsigned long)hcpu;
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800151 int rc = 0;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800152
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800153 switch (action) {
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800154 case CPU_UP_PREPARE:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700155 case CPU_UP_PREPARE_FROZEN:
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800156 rc = topology_add_dev(cpu);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800157 break;
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800158 case CPU_UP_CANCELED:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700159 case CPU_UP_CANCELED_FROZEN:
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800160 case CPU_DEAD:
Rafael J. Wysocki8bb78442007-05-09 02:35:10 -0700161 case CPU_DEAD_FROZEN:
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800162 topology_remove_dev(cpu);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800163 break;
164 }
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800165 return rc ? NOTIFY_BAD : NOTIFY_OK;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800166}
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800167
168static int __cpuinit topology_sysfs_init(void)
169{
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800170 int cpu;
171 int rc;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800172
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800173 for_each_online_cpu(cpu) {
174 rc = topology_add_dev(cpu);
175 if (rc)
176 return rc;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800177 }
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800178 hotcpu_notifier(topology_cpu_callback, 0);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800179
180 return 0;
181}
182
183device_initcall(topology_sysfs_init);