Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8 -*- */ |
| 2 | |
| 3 | /* Copyright (C) 2001 |
| 4 | * |
| 5 | * Author: J.E.J.Bottomley@HansenPartnership.com |
| 6 | * |
| 7 | * linux/arch/i386/kernel/voyager_thread.c |
| 8 | * |
| 9 | * This module provides the machine status monitor thread for the |
| 10 | * voyager architecture. This allows us to monitor the machine |
| 11 | * environment (temp, voltage, fan function) and the front panel and |
| 12 | * internal UPS. If a fault is detected, this thread takes corrective |
| 13 | * action (usually just informing init) |
| 14 | * */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/config.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/kernel_stat.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/mc146818rtc.h> |
| 22 | #include <linux/smp_lock.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/bootmem.h> |
| 25 | #include <linux/kmod.h> |
| 26 | #include <linux/completion.h> |
| 27 | #include <linux/sched.h> |
| 28 | #include <asm/desc.h> |
| 29 | #include <asm/voyager.h> |
| 30 | #include <asm/vic.h> |
| 31 | #include <asm/mtrr.h> |
| 32 | #include <asm/msr.h> |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #define THREAD_NAME "kvoyagerd" |
| 35 | |
| 36 | /* external variables */ |
| 37 | int kvoyagerd_running = 0; |
| 38 | DECLARE_MUTEX_LOCKED(kvoyagerd_sem); |
| 39 | |
| 40 | static int thread(void *); |
| 41 | |
| 42 | static __u8 set_timeout = 0; |
| 43 | |
| 44 | /* Start the machine monitor thread. Return 1 if OK, 0 if fail */ |
| 45 | static int __init |
| 46 | voyager_thread_start(void) |
| 47 | { |
| 48 | if(kernel_thread(thread, NULL, CLONE_KERNEL) < 0) { |
| 49 | /* This is serious, but not fatal */ |
| 50 | printk(KERN_ERR "Voyager: Failed to create system monitor thread!!!\n"); |
| 51 | return 1; |
| 52 | } |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int |
| 57 | execute(const char *string) |
| 58 | { |
| 59 | int ret; |
| 60 | |
| 61 | char *envp[] = { |
| 62 | "HOME=/", |
| 63 | "TERM=linux", |
| 64 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", |
| 65 | NULL, |
| 66 | }; |
| 67 | char *argv[] = { |
| 68 | "/bin/bash", |
| 69 | "-c", |
| 70 | (char *)string, |
| 71 | NULL, |
| 72 | }; |
| 73 | |
| 74 | if ((ret = call_usermodehelper(argv[0], argv, envp, 1)) != 0) { |
| 75 | printk(KERN_ERR "Voyager failed to run \"%s\": %i\n", |
| 76 | string, ret); |
| 77 | } |
| 78 | return ret; |
| 79 | } |
| 80 | |
| 81 | static void |
| 82 | check_from_kernel(void) |
| 83 | { |
| 84 | if(voyager_status.switch_off) { |
| 85 | |
| 86 | /* FIXME: This should be configureable via proc */ |
| 87 | execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1"); |
| 88 | } else if(voyager_status.power_fail) { |
| 89 | VDEBUG(("Voyager daemon detected AC power failure\n")); |
| 90 | |
| 91 | /* FIXME: This should be configureable via proc */ |
| 92 | execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1"); |
| 93 | set_timeout = 1; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | static void |
| 98 | check_continuing_condition(void) |
| 99 | { |
| 100 | if(voyager_status.power_fail) { |
| 101 | __u8 data; |
| 102 | voyager_cat_psi(VOYAGER_PSI_SUBREAD, |
| 103 | VOYAGER_PSI_AC_FAIL_REG, &data); |
| 104 | if((data & 0x1f) == 0) { |
| 105 | /* all power restored */ |
| 106 | printk(KERN_NOTICE "VOYAGER AC power restored, cancelling shutdown\n"); |
| 107 | /* FIXME: should be user configureable */ |
| 108 | execute("umask 600; echo O > /etc/powerstatus; kill -PWR 1"); |
| 109 | set_timeout = 0; |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | static void |
| 115 | wakeup(unsigned long unused) |
| 116 | { |
| 117 | up(&kvoyagerd_sem); |
| 118 | } |
| 119 | |
| 120 | static int |
| 121 | thread(void *unused) |
| 122 | { |
| 123 | struct timer_list wakeup_timer; |
| 124 | |
| 125 | kvoyagerd_running = 1; |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | daemonize(THREAD_NAME); |
| 128 | |
| 129 | set_timeout = 0; |
| 130 | |
| 131 | init_timer(&wakeup_timer); |
| 132 | |
| 133 | sigfillset(¤t->blocked); |
| 134 | current->signal->tty = NULL; |
| 135 | |
| 136 | printk(KERN_NOTICE "Voyager starting monitor thread\n"); |
| 137 | |
| 138 | for(;;) { |
| 139 | down_interruptible(&kvoyagerd_sem); |
| 140 | VDEBUG(("Voyager Daemon awoken\n")); |
| 141 | if(voyager_status.request_from_kernel == 0) { |
| 142 | /* probably awoken from timeout */ |
| 143 | check_continuing_condition(); |
| 144 | } else { |
| 145 | check_from_kernel(); |
| 146 | voyager_status.request_from_kernel = 0; |
| 147 | } |
| 148 | if(set_timeout) { |
| 149 | del_timer(&wakeup_timer); |
| 150 | wakeup_timer.expires = HZ + jiffies; |
| 151 | wakeup_timer.function = wakeup; |
| 152 | add_timer(&wakeup_timer); |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | static void __exit |
| 158 | voyager_thread_stop(void) |
| 159 | { |
| 160 | /* FIXME: do nothing at the moment */ |
| 161 | } |
| 162 | |
| 163 | module_init(voyager_thread_start); |
| 164 | //module_exit(voyager_thread_stop); |