mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 01:50:54 +07:00
405ae7d381
Globally, s/driverfs/sysfs/g. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
/*
|
|
* drivers/base/cpu.c - basic CPU class support
|
|
*/
|
|
|
|
#include <linux/sysdev.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/topology.h>
|
|
#include <linux/device.h>
|
|
#include <linux/node.h>
|
|
|
|
#include "base.h"
|
|
|
|
struct sysdev_class cpu_sysdev_class = {
|
|
set_kset_name("cpu"),
|
|
};
|
|
EXPORT_SYMBOL(cpu_sysdev_class);
|
|
|
|
static struct sys_device *cpu_sys_devices[NR_CPUS];
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
static ssize_t show_online(struct sys_device *dev, char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
|
|
return sprintf(buf, "%u\n", !!cpu_online(cpu->sysdev.id));
|
|
}
|
|
|
|
static ssize_t store_online(struct sys_device *dev, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
ssize_t ret;
|
|
|
|
switch (buf[0]) {
|
|
case '0':
|
|
ret = cpu_down(cpu->sysdev.id);
|
|
if (!ret)
|
|
kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
|
|
break;
|
|
case '1':
|
|
ret = cpu_up(cpu->sysdev.id);
|
|
if (!ret)
|
|
kobject_uevent(&dev->kobj, KOBJ_ONLINE);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (ret >= 0)
|
|
ret = count;
|
|
return ret;
|
|
}
|
|
static SYSDEV_ATTR(online, 0600, show_online, store_online);
|
|
|
|
static void __devinit register_cpu_control(struct cpu *cpu)
|
|
{
|
|
sysdev_create_file(&cpu->sysdev, &attr_online);
|
|
}
|
|
void unregister_cpu(struct cpu *cpu)
|
|
{
|
|
int logical_cpu = cpu->sysdev.id;
|
|
|
|
unregister_cpu_under_node(logical_cpu, cpu_to_node(logical_cpu));
|
|
|
|
sysdev_remove_file(&cpu->sysdev, &attr_online);
|
|
|
|
sysdev_unregister(&cpu->sysdev);
|
|
cpu_sys_devices[logical_cpu] = NULL;
|
|
return;
|
|
}
|
|
#else /* ... !CONFIG_HOTPLUG_CPU */
|
|
static inline void register_cpu_control(struct cpu *cpu)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
#include <linux/kexec.h>
|
|
|
|
static ssize_t show_crash_notes(struct sys_device *dev, char *buf)
|
|
{
|
|
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
|
|
ssize_t rc;
|
|
unsigned long long addr;
|
|
int cpunum;
|
|
|
|
cpunum = cpu->sysdev.id;
|
|
|
|
/*
|
|
* Might be reading other cpu's data based on which cpu read thread
|
|
* has been scheduled. But cpu data (memory) is allocated once during
|
|
* boot up and this data does not change there after. Hence this
|
|
* operation should be safe. No locking required.
|
|
*/
|
|
addr = __pa(per_cpu_ptr(crash_notes, cpunum));
|
|
rc = sprintf(buf, "%Lx\n", addr);
|
|
return rc;
|
|
}
|
|
static SYSDEV_ATTR(crash_notes, 0400, show_crash_notes, NULL);
|
|
#endif
|
|
|
|
/*
|
|
* register_cpu - Setup a sysfs device for a CPU.
|
|
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
|
|
* sysfs for this CPU.
|
|
* @num - CPU number to use when creating the device.
|
|
*
|
|
* Initialize and register the CPU device.
|
|
*/
|
|
int __devinit register_cpu(struct cpu *cpu, int num)
|
|
{
|
|
int error;
|
|
cpu->node_id = cpu_to_node(num);
|
|
cpu->sysdev.id = num;
|
|
cpu->sysdev.cls = &cpu_sysdev_class;
|
|
|
|
error = sysdev_register(&cpu->sysdev);
|
|
|
|
if (!error && cpu->hotpluggable)
|
|
register_cpu_control(cpu);
|
|
if (!error)
|
|
cpu_sys_devices[num] = &cpu->sysdev;
|
|
if (!error)
|
|
register_cpu_under_node(num, cpu_to_node(num));
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
if (!error)
|
|
error = sysdev_create_file(&cpu->sysdev, &attr_crash_notes);
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
struct sys_device *get_cpu_sysdev(unsigned cpu)
|
|
{
|
|
if (cpu < NR_CPUS)
|
|
return cpu_sys_devices[cpu];
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_cpu_sysdev);
|
|
|
|
int __init cpu_dev_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = sysdev_class_register(&cpu_sysdev_class);
|
|
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
|
|
if (!err)
|
|
err = sched_create_sysfs_power_savings_entries(&cpu_sysdev_class);
|
|
#endif
|
|
|
|
return err;
|
|
}
|