129 строки
3.0 KiB
C
129 строки
3.0 KiB
C
/* -*- mode: c; c-basic-offset: 8 -*- */
|
|
|
|
/* Copyright (C) 2001
|
|
*
|
|
* Author: J.E.J.Bottomley@HansenPartnership.com
|
|
*
|
|
* This module provides the machine status monitor thread for the
|
|
* voyager architecture. This allows us to monitor the machine
|
|
* environment (temp, voltage, fan function) and the front panel and
|
|
* internal UPS. If a fault is detected, this thread takes corrective
|
|
* action (usually just informing init)
|
|
* */
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/mc146818rtc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kthread.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/voyager.h>
|
|
#include <asm/vic.h>
|
|
#include <asm/mtrr.h>
|
|
#include <asm/msr.h>
|
|
|
|
struct task_struct *voyager_thread;
|
|
static __u8 set_timeout;
|
|
|
|
static int execute(const char *string)
|
|
{
|
|
int ret;
|
|
|
|
char *envp[] = {
|
|
"HOME=/",
|
|
"TERM=linux",
|
|
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
|
|
NULL,
|
|
};
|
|
char *argv[] = {
|
|
"/bin/bash",
|
|
"-c",
|
|
(char *)string,
|
|
NULL,
|
|
};
|
|
|
|
if ((ret =
|
|
call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC)) != 0) {
|
|
printk(KERN_ERR "Voyager failed to run \"%s\": %i\n", string,
|
|
ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void check_from_kernel(void)
|
|
{
|
|
if (voyager_status.switch_off) {
|
|
|
|
/* FIXME: This should be configurable via proc */
|
|
execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1");
|
|
} else if (voyager_status.power_fail) {
|
|
VDEBUG(("Voyager daemon detected AC power failure\n"));
|
|
|
|
/* FIXME: This should be configureable via proc */
|
|
execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1");
|
|
set_timeout = 1;
|
|
}
|
|
}
|
|
|
|
static void check_continuing_condition(void)
|
|
{
|
|
if (voyager_status.power_fail) {
|
|
__u8 data;
|
|
voyager_cat_psi(VOYAGER_PSI_SUBREAD,
|
|
VOYAGER_PSI_AC_FAIL_REG, &data);
|
|
if ((data & 0x1f) == 0) {
|
|
/* all power restored */
|
|
printk(KERN_NOTICE
|
|
"VOYAGER AC power restored, cancelling shutdown\n");
|
|
/* FIXME: should be user configureable */
|
|
execute
|
|
("umask 600; echo O > /etc/powerstatus; kill -PWR 1");
|
|
set_timeout = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int thread(void *unused)
|
|
{
|
|
printk(KERN_NOTICE "Voyager starting monitor thread\n");
|
|
|
|
for (;;) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT);
|
|
|
|
VDEBUG(("Voyager Daemon awoken\n"));
|
|
if (voyager_status.request_from_kernel == 0) {
|
|
/* probably awoken from timeout */
|
|
check_continuing_condition();
|
|
} else {
|
|
check_from_kernel();
|
|
voyager_status.request_from_kernel = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __init voyager_thread_start(void)
|
|
{
|
|
voyager_thread = kthread_run(thread, NULL, "kvoyagerd");
|
|
if (IS_ERR(voyager_thread)) {
|
|
printk(KERN_ERR
|
|
"Voyager: Failed to create system monitor thread.\n");
|
|
return PTR_ERR(voyager_thread);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit voyager_thread_stop(void)
|
|
{
|
|
kthread_stop(voyager_thread);
|
|
}
|
|
|
|
module_init(voyager_thread_start);
|
|
module_exit(voyager_thread_stop);
|