You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
155 lines
4.1 KiB
155 lines
4.1 KiB
/*
|
|
* driver/base/topology.c - Populate sysfs with cpu topology information
|
|
*
|
|
* Written by: Zhang Yanmin, Intel Corporation
|
|
*
|
|
* Copyright (C) 2006, Intel Corp.
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/module.h>
|
|
#include <linux/hardirq.h>
|
|
#include <linux/topology.h>
|
|
|
|
#define define_id_show_func(name) \
|
|
static ssize_t name##_show(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
return sprintf(buf, "%d\n", topology_##name(dev->id)); \
|
|
}
|
|
|
|
#define define_siblings_show_map(name, mask) \
|
|
static ssize_t name##_show(struct device *dev, \
|
|
struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
|
|
}
|
|
|
|
#define define_siblings_show_list(name, mask) \
|
|
static ssize_t name##_list_show(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
|
|
}
|
|
|
|
#define define_siblings_show_func(name, mask) \
|
|
define_siblings_show_map(name, mask); \
|
|
define_siblings_show_list(name, mask)
|
|
|
|
define_id_show_func(physical_package_id);
|
|
static DEVICE_ATTR_RO(physical_package_id);
|
|
|
|
define_id_show_func(core_id);
|
|
static DEVICE_ATTR_RO(core_id);
|
|
|
|
define_siblings_show_func(thread_siblings, sibling_cpumask);
|
|
static DEVICE_ATTR_RO(thread_siblings);
|
|
static DEVICE_ATTR_RO(thread_siblings_list);
|
|
|
|
define_siblings_show_func(core_siblings, core_cpumask);
|
|
static DEVICE_ATTR_RO(core_siblings);
|
|
static DEVICE_ATTR_RO(core_siblings_list);
|
|
|
|
#ifdef CONFIG_SCHED_BOOK
|
|
define_id_show_func(book_id);
|
|
static DEVICE_ATTR_RO(book_id);
|
|
define_siblings_show_func(book_siblings, book_cpumask);
|
|
static DEVICE_ATTR_RO(book_siblings);
|
|
static DEVICE_ATTR_RO(book_siblings_list);
|
|
#endif
|
|
|
|
static struct attribute *default_attrs[] = {
|
|
&dev_attr_physical_package_id.attr,
|
|
&dev_attr_core_id.attr,
|
|
&dev_attr_thread_siblings.attr,
|
|
&dev_attr_thread_siblings_list.attr,
|
|
&dev_attr_core_siblings.attr,
|
|
&dev_attr_core_siblings_list.attr,
|
|
#ifdef CONFIG_SCHED_BOOK
|
|
&dev_attr_book_id.attr,
|
|
&dev_attr_book_siblings.attr,
|
|
&dev_attr_book_siblings_list.attr,
|
|
#endif
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group topology_attr_group = {
|
|
.attrs = default_attrs,
|
|
.name = "topology"
|
|
};
|
|
|
|
/* Add/Remove cpu_topology interface for CPU device */
|
|
static int topology_add_dev(unsigned int cpu)
|
|
{
|
|
struct device *dev = get_cpu_device(cpu);
|
|
|
|
return sysfs_create_group(&dev->kobj, &topology_attr_group);
|
|
}
|
|
|
|
static void topology_remove_dev(unsigned int cpu)
|
|
{
|
|
struct device *dev = get_cpu_device(cpu);
|
|
|
|
sysfs_remove_group(&dev->kobj, &topology_attr_group);
|
|
}
|
|
|
|
static int topology_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
int rc = 0;
|
|
|
|
switch (action) {
|
|
case CPU_UP_PREPARE:
|
|
case CPU_UP_PREPARE_FROZEN:
|
|
rc = topology_add_dev(cpu);
|
|
break;
|
|
case CPU_UP_CANCELED:
|
|
case CPU_UP_CANCELED_FROZEN:
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
topology_remove_dev(cpu);
|
|
break;
|
|
}
|
|
return notifier_from_errno(rc);
|
|
}
|
|
|
|
static int topology_sysfs_init(void)
|
|
{
|
|
int cpu;
|
|
int rc = 0;
|
|
|
|
cpu_notifier_register_begin();
|
|
|
|
for_each_online_cpu(cpu) {
|
|
rc = topology_add_dev(cpu);
|
|
if (rc)
|
|
goto out;
|
|
}
|
|
__hotcpu_notifier(topology_cpu_callback, 0);
|
|
|
|
out:
|
|
cpu_notifier_register_done();
|
|
return rc;
|
|
}
|
|
|
|
device_initcall(topology_sysfs_init);
|
|
|