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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/mm.h>
27#include <linux/cpu.h>
28#include <linux/module.h>
David Millerb13d3722009-01-07 15:30:05 -080029#include <linux/hardirq.h>
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080030#include <linux/topology.h>
31
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080032#define define_id_show_func(name) \
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010033static ssize_t name##_show(struct device *dev, \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080034 struct device_attribute *attr, char *buf) \
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080035{ \
Vincent Stehlé53974e02014-04-04 08:43:18 +020036 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080037}
38
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010039#define define_siblings_show_map(name, mask) \
40static ssize_t name##_show(struct device *dev, \
Kay Sievers8a25a2f2011-12-21 14:29:42 -080041 struct device_attribute *attr, char *buf) \
Mike Travis23ca4bb2008-05-12 21:21:12 +020042{ \
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010043 return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
Mike Travis23ca4bb2008-05-12 21:21:12 +020044}
45
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010046#define define_siblings_show_list(name, mask) \
47static ssize_t name##_list_show(struct device *dev, \
48 struct device_attribute *attr, \
49 char *buf) \
Mike Travis23ca4bb2008-05-12 21:21:12 +020050{ \
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010051 return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
Mike Travis23ca4bb2008-05-12 21:21:12 +020052}
Mike Travis23ca4bb2008-05-12 21:21:12 +020053
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010054#define define_siblings_show_func(name, mask) \
55 define_siblings_show_map(name, mask); \
56 define_siblings_show_list(name, mask)
Mike Travis39106dc2008-04-08 11:43:03 -070057
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080058define_id_show_func(physical_package_id);
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010059static DEVICE_ATTR_RO(physical_package_id);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080060
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080061define_id_show_func(core_id);
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010062static DEVICE_ATTR_RO(core_id);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080063
Bartosz Golaszewski06931e62015-05-26 15:11:28 +020064define_siblings_show_func(thread_siblings, sibling_cpumask);
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010065static DEVICE_ATTR_RO(thread_siblings);
66static DEVICE_ATTR_RO(thread_siblings_list);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080067
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010068define_siblings_show_func(core_siblings, core_cpumask);
69static DEVICE_ATTR_RO(core_siblings);
70static DEVICE_ATTR_RO(core_siblings_list);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080071
Heiko Carstensb40d8ed2010-08-31 10:28:17 +020072#ifdef CONFIG_SCHED_BOOK
73define_id_show_func(book_id);
Sudeep Hollad6ea8d02014-09-30 14:48:23 +010074static DEVICE_ATTR_RO(book_id);
75define_siblings_show_func(book_siblings, book_cpumask);
76static DEVICE_ATTR_RO(book_siblings);
77static DEVICE_ATTR_RO(book_siblings_list);
Heiko Carstensb40d8ed2010-08-31 10:28:17 +020078#endif
79
Heiko Carstensa62247e2016-05-21 11:10:13 +020080#ifdef CONFIG_SCHED_DRAWER
81define_id_show_func(drawer_id);
82static DEVICE_ATTR_RO(drawer_id);
83define_siblings_show_func(drawer_siblings, drawer_cpumask);
84static DEVICE_ATTR_RO(drawer_siblings);
85static DEVICE_ATTR_RO(drawer_siblings_list);
86#endif
87
Zhang, Yanmin69dcc992006-02-03 03:04:36 -080088static struct attribute *default_attrs[] = {
Kay Sievers8a25a2f2011-12-21 14:29:42 -080089 &dev_attr_physical_package_id.attr,
90 &dev_attr_core_id.attr,
91 &dev_attr_thread_siblings.attr,
92 &dev_attr_thread_siblings_list.attr,
93 &dev_attr_core_siblings.attr,
94 &dev_attr_core_siblings_list.attr,
Heiko Carstensb40d8ed2010-08-31 10:28:17 +020095#ifdef CONFIG_SCHED_BOOK
Kay Sievers8a25a2f2011-12-21 14:29:42 -080096 &dev_attr_book_id.attr,
97 &dev_attr_book_siblings.attr,
98 &dev_attr_book_siblings_list.attr,
Heiko Carstensb40d8ed2010-08-31 10:28:17 +020099#endif
Heiko Carstensa62247e2016-05-21 11:10:13 +0200100#ifdef CONFIG_SCHED_DRAWER
101 &dev_attr_drawer_id.attr,
102 &dev_attr_drawer_siblings.attr,
103 &dev_attr_drawer_siblings_list.attr,
104#endif
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800105 NULL
106};
107
Arvind Yadavdf44d302017-08-02 19:36:20 +0530108static const struct attribute_group topology_attr_group = {
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800109 .attrs = default_attrs,
110 .name = "topology"
111};
112
113/* Add/Remove cpu_topology interface for CPU device */
Paul Gortmakera83048e2013-06-19 15:22:41 -0400114static int topology_add_dev(unsigned int cpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800115{
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800116 struct device *dev = get_cpu_device(cpu);
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800117
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800118 return sysfs_create_group(&dev->kobj, &topology_attr_group);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800119}
120
Sebastian Andrzej Siewior38643a02016-11-03 15:50:09 +0100121static int topology_remove_dev(unsigned int cpu)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800122{
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800123 struct device *dev = get_cpu_device(cpu);
Heiko Carstens06a4bca2006-11-08 19:46:09 -0800124
Kay Sievers8a25a2f2011-12-21 14:29:42 -0800125 sysfs_remove_group(&dev->kobj, &topology_attr_group);
Sebastian Andrzej Siewior38643a02016-11-03 15:50:09 +0100126 return 0;
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800127}
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800128
Paul Gortmakera83048e2013-06-19 15:22:41 -0400129static int topology_sysfs_init(void)
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800130{
Sebastian Andrzej Siewior38643a02016-11-03 15:50:09 +0100131 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
132 "base/topology:prepare", topology_add_dev,
133 topology_remove_dev);
Zhang, Yanmin69dcc992006-02-03 03:04:36 -0800134}
135
136device_initcall(topology_sysfs_init);