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b40d8ed4e4
Create attributes: /sys/devices/system/cpu/cpuX/topology/book_id /sys/devices/system/cpu/cpuX/topology/book_siblings which show the book id and the book siblings of a cpu. Unlike the attributes for SMT and MC these attributes are only present if CONFIG_SCHED_BOOK is set. There is no reason to pollute sysfs for every architecture with unused attributes. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20100831082844.435648457@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
198 lines
5.3 KiB
C
198 lines
5.3 KiB
C
/*
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* driver/base/topology.c - Populate sysfs with cpu topology information
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*
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* Written by: Zhang Yanmin, Intel Corporation
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*
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* Copyright (C) 2006, Intel Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/sysdev.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/cpu.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/topology.h>
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#define define_one_ro_named(_name, _func) \
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static SYSDEV_ATTR(_name, 0444, _func, NULL)
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#define define_one_ro(_name) \
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static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
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#define define_id_show_func(name) \
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static ssize_t show_##name(struct sys_device *dev, \
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struct sysdev_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return sprintf(buf, "%d\n", topology_##name(cpu)); \
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}
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#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
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defined(topology_book_cpumask)
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static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
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{
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ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
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int n = 0;
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if (len > 1) {
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n = type?
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cpulist_scnprintf(buf, len-2, mask) :
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cpumask_scnprintf(buf, len-2, mask);
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buf[n++] = '\n';
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buf[n] = '\0';
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}
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return n;
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}
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#endif
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#ifdef arch_provides_topology_pointers
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#define define_siblings_show_map(name) \
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static ssize_t show_##name(struct sys_device *dev, \
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struct sysdev_attribute *attr, char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return show_cpumap(0, topology_##name(cpu), buf); \
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}
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#define define_siblings_show_list(name) \
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static ssize_t show_##name##_list(struct sys_device *dev, \
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struct sysdev_attribute *attr, \
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char *buf) \
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{ \
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unsigned int cpu = dev->id; \
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return show_cpumap(1, topology_##name(cpu), buf); \
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}
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#else
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#define define_siblings_show_map(name) \
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static ssize_t show_##name(struct sys_device *dev, \
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struct sysdev_attribute *attr, char *buf) \
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{ \
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return show_cpumap(0, topology_##name(dev->id), buf); \
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}
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#define define_siblings_show_list(name) \
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static ssize_t show_##name##_list(struct sys_device *dev, \
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struct sysdev_attribute *attr, \
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char *buf) \
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{ \
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return show_cpumap(1, topology_##name(dev->id), buf); \
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}
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#endif
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#define define_siblings_show_func(name) \
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define_siblings_show_map(name); define_siblings_show_list(name)
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define_id_show_func(physical_package_id);
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define_one_ro(physical_package_id);
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define_id_show_func(core_id);
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define_one_ro(core_id);
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define_siblings_show_func(thread_cpumask);
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define_one_ro_named(thread_siblings, show_thread_cpumask);
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define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
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define_siblings_show_func(core_cpumask);
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define_one_ro_named(core_siblings, show_core_cpumask);
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define_one_ro_named(core_siblings_list, show_core_cpumask_list);
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#ifdef CONFIG_SCHED_BOOK
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define_id_show_func(book_id);
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define_one_ro(book_id);
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define_siblings_show_func(book_cpumask);
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define_one_ro_named(book_siblings, show_book_cpumask);
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define_one_ro_named(book_siblings_list, show_book_cpumask_list);
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#endif
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static struct attribute *default_attrs[] = {
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&attr_physical_package_id.attr,
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&attr_core_id.attr,
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&attr_thread_siblings.attr,
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&attr_thread_siblings_list.attr,
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&attr_core_siblings.attr,
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&attr_core_siblings_list.attr,
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#ifdef CONFIG_SCHED_BOOK
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&attr_book_id.attr,
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&attr_book_siblings.attr,
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&attr_book_siblings_list.attr,
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#endif
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NULL
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};
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static struct attribute_group topology_attr_group = {
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.attrs = default_attrs,
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.name = "topology"
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};
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/* Add/Remove cpu_topology interface for CPU device */
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static int __cpuinit topology_add_dev(unsigned int cpu)
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{
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struct sys_device *sys_dev = get_cpu_sysdev(cpu);
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return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
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}
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static void __cpuinit topology_remove_dev(unsigned int cpu)
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{
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struct sys_device *sys_dev = get_cpu_sysdev(cpu);
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sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
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}
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static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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int rc = 0;
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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rc = topology_add_dev(cpu);
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break;
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case CPU_UP_CANCELED:
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case CPU_UP_CANCELED_FROZEN:
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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topology_remove_dev(cpu);
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break;
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}
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return notifier_from_errno(rc);
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}
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static int __cpuinit topology_sysfs_init(void)
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{
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int cpu;
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int rc;
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for_each_online_cpu(cpu) {
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rc = topology_add_dev(cpu);
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if (rc)
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return rc;
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}
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hotcpu_notifier(topology_cpu_callback, 0);
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return 0;
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}
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device_initcall(topology_sysfs_init);
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