cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

power.c (1643B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Interface for power-management for ppc64 compliant platform
      4 *
      5 *  Manish Ahuja <mahuja@us.ibm.com>
      6 *
      7 *  Feb 2007
      8 *
      9 *  Copyright (C) 2007 IBM Corporation.
     10 */
     11
     12#include <linux/kobject.h>
     13#include <linux/string.h>
     14#include <linux/errno.h>
     15#include <linux/init.h>
     16#include <asm/machdep.h>
     17
     18#include "pseries.h"
     19
     20unsigned long rtas_poweron_auto; /* default and normal state is 0 */
     21
     22static ssize_t auto_poweron_show(struct kobject *kobj,
     23				 struct kobj_attribute *attr, char *buf)
     24{
     25        return sprintf(buf, "%lu\n", rtas_poweron_auto);
     26}
     27
     28static ssize_t auto_poweron_store(struct kobject *kobj,
     29				  struct kobj_attribute *attr,
     30				  const char *buf, size_t n)
     31{
     32	int ret;
     33	unsigned long ups_restart;
     34	ret = sscanf(buf, "%lu", &ups_restart);
     35
     36	if ((ret == 1) && ((ups_restart == 1) || (ups_restart == 0))){
     37		rtas_poweron_auto = ups_restart;
     38		return n;
     39	}
     40	return -EINVAL;
     41}
     42
     43static struct kobj_attribute auto_poweron_attr =
     44	__ATTR(auto_poweron, 0644, auto_poweron_show, auto_poweron_store);
     45
     46#ifndef CONFIG_PM
     47struct kobject *power_kobj;
     48
     49static struct attribute *g[] = {
     50        &auto_poweron_attr.attr,
     51        NULL,
     52};
     53
     54static const struct attribute_group attr_group = {
     55        .attrs = g,
     56};
     57
     58static int __init pm_init(void)
     59{
     60	power_kobj = kobject_create_and_add("power", NULL);
     61	if (!power_kobj)
     62		return -ENOMEM;
     63	return sysfs_create_group(power_kobj, &attr_group);
     64}
     65machine_core_initcall(pseries, pm_init);
     66#else
     67static int __init apo_pm_init(void)
     68{
     69	return (sysfs_create_file(power_kobj, &auto_poweron_attr.attr));
     70}
     71machine_device_initcall(pseries, apo_pm_init);
     72#endif