forked from Minki/linux
be6b5a3505
Use hotplug version of register_cpu_notifier in late init functions. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
149 lines
3.8 KiB
C
149 lines
3.8 KiB
C
/*
|
|
* 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/sysdev.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/module.h>
|
|
#include <linux/topology.h>
|
|
|
|
#define define_one_ro(_name) \
|
|
static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
|
|
|
|
#define define_id_show_func(name) \
|
|
static ssize_t show_##name(struct sys_device *dev, char *buf) \
|
|
{ \
|
|
unsigned int cpu = dev->id; \
|
|
return sprintf(buf, "%d\n", topology_##name(cpu)); \
|
|
}
|
|
|
|
#define define_siblings_show_func(name) \
|
|
static ssize_t show_##name(struct sys_device *dev, char *buf) \
|
|
{ \
|
|
ssize_t len = -1; \
|
|
unsigned int cpu = dev->id; \
|
|
len = cpumask_scnprintf(buf, NR_CPUS+1, topology_##name(cpu)); \
|
|
return (len + sprintf(buf + len, "\n")); \
|
|
}
|
|
|
|
#ifdef topology_physical_package_id
|
|
define_id_show_func(physical_package_id);
|
|
define_one_ro(physical_package_id);
|
|
#define ref_physical_package_id_attr &attr_physical_package_id.attr,
|
|
#else
|
|
#define ref_physical_package_id_attr
|
|
#endif
|
|
|
|
#ifdef topology_core_id
|
|
define_id_show_func(core_id);
|
|
define_one_ro(core_id);
|
|
#define ref_core_id_attr &attr_core_id.attr,
|
|
#else
|
|
#define ref_core_id_attr
|
|
#endif
|
|
|
|
#ifdef topology_thread_siblings
|
|
define_siblings_show_func(thread_siblings);
|
|
define_one_ro(thread_siblings);
|
|
#define ref_thread_siblings_attr &attr_thread_siblings.attr,
|
|
#else
|
|
#define ref_thread_siblings_attr
|
|
#endif
|
|
|
|
#ifdef topology_core_siblings
|
|
define_siblings_show_func(core_siblings);
|
|
define_one_ro(core_siblings);
|
|
#define ref_core_siblings_attr &attr_core_siblings.attr,
|
|
#else
|
|
#define ref_core_siblings_attr
|
|
#endif
|
|
|
|
static struct attribute *default_attrs[] = {
|
|
ref_physical_package_id_attr
|
|
ref_core_id_attr
|
|
ref_thread_siblings_attr
|
|
ref_core_siblings_attr
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group topology_attr_group = {
|
|
.attrs = default_attrs,
|
|
.name = "topology"
|
|
};
|
|
|
|
/* Add/Remove cpu_topology interface for CPU device */
|
|
static int __cpuinit topology_add_dev(struct sys_device * sys_dev)
|
|
{
|
|
sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
|
|
return 0;
|
|
}
|
|
|
|
static int __cpuinit topology_remove_dev(struct sys_device * sys_dev)
|
|
{
|
|
sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
|
|
return 0;
|
|
}
|
|
|
|
static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (unsigned long)hcpu;
|
|
struct sys_device *sys_dev;
|
|
|
|
sys_dev = get_cpu_sysdev(cpu);
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
topology_add_dev(sys_dev);
|
|
break;
|
|
case CPU_DEAD:
|
|
topology_remove_dev(sys_dev);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block __cpuinitdata topology_cpu_notifier =
|
|
{
|
|
.notifier_call = topology_cpu_callback,
|
|
};
|
|
|
|
static int __cpuinit topology_sysfs_init(void)
|
|
{
|
|
int i;
|
|
|
|
for_each_online_cpu(i) {
|
|
topology_cpu_callback(&topology_cpu_notifier, CPU_ONLINE,
|
|
(void *)(long)i);
|
|
}
|
|
|
|
register_hotcpu_notifier(&topology_cpu_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(topology_sysfs_init);
|
|
|