156 lines
4.1 KiB
C
156 lines
4.1 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/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_id_show_func(name) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return sprintf(buf, "%d\n", topology_##name(dev->id)); \
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}
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#define define_siblings_show_map(name, mask) \
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static ssize_t name##_show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
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}
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#define define_siblings_show_list(name, mask) \
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static ssize_t name##_list_show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
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}
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#define define_siblings_show_func(name, mask) \
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define_siblings_show_map(name, mask); \
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define_siblings_show_list(name, mask)
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define_id_show_func(physical_package_id);
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static DEVICE_ATTR_RO(physical_package_id);
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define_id_show_func(core_id);
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static DEVICE_ATTR_RO(core_id);
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define_siblings_show_func(thread_siblings, sibling_cpumask);
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static DEVICE_ATTR_RO(thread_siblings);
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static DEVICE_ATTR_RO(thread_siblings_list);
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define_siblings_show_func(core_siblings, core_cpumask);
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static DEVICE_ATTR_RO(core_siblings);
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static DEVICE_ATTR_RO(core_siblings_list);
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#ifdef CONFIG_SCHED_BOOK
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define_id_show_func(book_id);
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static DEVICE_ATTR_RO(book_id);
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define_siblings_show_func(book_siblings, book_cpumask);
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static DEVICE_ATTR_RO(book_siblings);
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static DEVICE_ATTR_RO(book_siblings_list);
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#endif
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static struct attribute *default_attrs[] = {
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&dev_attr_physical_package_id.attr,
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&dev_attr_core_id.attr,
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&dev_attr_thread_siblings.attr,
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&dev_attr_thread_siblings_list.attr,
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&dev_attr_core_siblings.attr,
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&dev_attr_core_siblings_list.attr,
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#ifdef CONFIG_SCHED_BOOK
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&dev_attr_book_id.attr,
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&dev_attr_book_siblings.attr,
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&dev_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 topology_add_dev(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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return sysfs_create_group(&dev->kobj, &topology_attr_group);
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}
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static void topology_remove_dev(unsigned int cpu)
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{
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struct device *dev = get_cpu_device(cpu);
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sysfs_remove_group(&dev->kobj, &topology_attr_group);
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}
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static int 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 topology_sysfs_init(void)
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{
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int cpu;
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int rc = 0;
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cpu_notifier_register_begin();
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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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goto out;
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}
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__hotcpu_notifier(topology_cpu_callback, 0);
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out:
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cpu_notifier_register_done();
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return rc;
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}
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device_initcall(topology_sysfs_init);
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