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Commit | Line | Data |
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69dcc991 ZY |
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 | */ | |
69dcc991 ZY |
26 | #include <linux/mm.h> |
27 | #include <linux/cpu.h> | |
28 | #include <linux/module.h> | |
b13d3720 | 29 | #include <linux/hardirq.h> |
69dcc991 ZY |
30 | #include <linux/topology.h> |
31 | ||
69dcc991 | 32 | #define define_id_show_func(name) \ |
d6ea8d01 | 33 | static ssize_t name##_show(struct device *dev, \ |
8a25a2fd | 34 | struct device_attribute *attr, char *buf) \ |
69dcc991 | 35 | { \ |
53974e06 | 36 | return sprintf(buf, "%d\n", topology_##name(dev->id)); \ |
69dcc991 ZY |
37 | } |
38 | ||
d6ea8d01 SH |
39 | #define define_siblings_show_map(name, mask) \ |
40 | static ssize_t name##_show(struct device *dev, \ | |
8a25a2fd | 41 | struct device_attribute *attr, char *buf) \ |
23ca4bba | 42 | { \ |
d6ea8d01 | 43 | return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\ |
23ca4bba MT |
44 | } |
45 | ||
d6ea8d01 SH |
46 | #define define_siblings_show_list(name, mask) \ |
47 | static ssize_t name##_list_show(struct device *dev, \ | |
48 | struct device_attribute *attr, \ | |
49 | char *buf) \ | |
23ca4bba | 50 | { \ |
d6ea8d01 | 51 | return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\ |
23ca4bba | 52 | } |
23ca4bba | 53 | |
d6ea8d01 SH |
54 | #define define_siblings_show_func(name, mask) \ |
55 | define_siblings_show_map(name, mask); \ | |
56 | define_siblings_show_list(name, mask) | |
39106dcf | 57 | |
69dcc991 | 58 | define_id_show_func(physical_package_id); |
d6ea8d01 | 59 | static DEVICE_ATTR_RO(physical_package_id); |
69dcc991 | 60 | |
69dcc991 | 61 | define_id_show_func(core_id); |
d6ea8d01 | 62 | static DEVICE_ATTR_RO(core_id); |
69dcc991 | 63 | |
d6ea8d01 SH |
64 | define_siblings_show_func(thread_siblings, thread_cpumask); |
65 | static DEVICE_ATTR_RO(thread_siblings); | |
66 | static DEVICE_ATTR_RO(thread_siblings_list); | |
69dcc991 | 67 | |
d6ea8d01 SH |
68 | define_siblings_show_func(core_siblings, core_cpumask); |
69 | static DEVICE_ATTR_RO(core_siblings); | |
70 | static DEVICE_ATTR_RO(core_siblings_list); | |
69dcc991 | 71 | |
b40d8ed4 HC |
72 | #ifdef CONFIG_SCHED_BOOK |
73 | define_id_show_func(book_id); | |
d6ea8d01 SH |
74 | static DEVICE_ATTR_RO(book_id); |
75 | define_siblings_show_func(book_siblings, book_cpumask); | |
76 | static DEVICE_ATTR_RO(book_siblings); | |
77 | static DEVICE_ATTR_RO(book_siblings_list); | |
b40d8ed4 HC |
78 | #endif |
79 | ||
69dcc991 | 80 | static struct attribute *default_attrs[] = { |
8a25a2fd KS |
81 | &dev_attr_physical_package_id.attr, |
82 | &dev_attr_core_id.attr, | |
83 | &dev_attr_thread_siblings.attr, | |
84 | &dev_attr_thread_siblings_list.attr, | |
85 | &dev_attr_core_siblings.attr, | |
86 | &dev_attr_core_siblings_list.attr, | |
b40d8ed4 | 87 | #ifdef CONFIG_SCHED_BOOK |
8a25a2fd KS |
88 | &dev_attr_book_id.attr, |
89 | &dev_attr_book_siblings.attr, | |
90 | &dev_attr_book_siblings_list.attr, | |
b40d8ed4 | 91 | #endif |
69dcc991 ZY |
92 | NULL |
93 | }; | |
94 | ||
95 | static struct attribute_group topology_attr_group = { | |
96 | .attrs = default_attrs, | |
97 | .name = "topology" | |
98 | }; | |
99 | ||
100 | /* Add/Remove cpu_topology interface for CPU device */ | |
a83048eb | 101 | static int topology_add_dev(unsigned int cpu) |
69dcc991 | 102 | { |
8a25a2fd | 103 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 104 | |
8a25a2fd | 105 | return sysfs_create_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
106 | } |
107 | ||
a83048eb | 108 | static void topology_remove_dev(unsigned int cpu) |
69dcc991 | 109 | { |
8a25a2fd | 110 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 111 | |
8a25a2fd | 112 | sysfs_remove_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
113 | } |
114 | ||
a83048eb PG |
115 | static int topology_cpu_callback(struct notifier_block *nfb, |
116 | unsigned long action, void *hcpu) | |
69dcc991 ZY |
117 | { |
118 | unsigned int cpu = (unsigned long)hcpu; | |
06a4bcae | 119 | int rc = 0; |
69dcc991 | 120 | |
69dcc991 | 121 | switch (action) { |
06a4bcae | 122 | case CPU_UP_PREPARE: |
8bb78442 | 123 | case CPU_UP_PREPARE_FROZEN: |
06a4bcae | 124 | rc = topology_add_dev(cpu); |
69dcc991 | 125 | break; |
06a4bcae | 126 | case CPU_UP_CANCELED: |
8bb78442 | 127 | case CPU_UP_CANCELED_FROZEN: |
69dcc991 | 128 | case CPU_DEAD: |
8bb78442 | 129 | case CPU_DEAD_FROZEN: |
06a4bcae | 130 | topology_remove_dev(cpu); |
69dcc991 ZY |
131 | break; |
132 | } | |
ad84bb5b | 133 | return notifier_from_errno(rc); |
69dcc991 | 134 | } |
69dcc991 | 135 | |
a83048eb | 136 | static int topology_sysfs_init(void) |
69dcc991 | 137 | { |
06a4bcae | 138 | int cpu; |
e12b7111 SB |
139 | int rc = 0; |
140 | ||
141 | cpu_notifier_register_begin(); | |
69dcc991 | 142 | |
06a4bcae HC |
143 | for_each_online_cpu(cpu) { |
144 | rc = topology_add_dev(cpu); | |
145 | if (rc) | |
e12b7111 | 146 | goto out; |
69dcc991 | 147 | } |
e12b7111 | 148 | __hotcpu_notifier(topology_cpu_callback, 0); |
69dcc991 | 149 | |
e12b7111 SB |
150 | out: |
151 | cpu_notifier_register_done(); | |
152 | return rc; | |
69dcc991 ZY |
153 | } |
154 | ||
155 | device_initcall(topology_sysfs_init); |