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1da177e4 LT |
1 | /* -*- mode: c; c-basic-offset: 8 -*- */ |
2 | ||
3 | /* Copyright (C) 2001 | |
4 | * | |
5 | * Author: J.E.J.Bottomley@HansenPartnership.com | |
6 | * | |
1da177e4 LT |
7 | * This module provides the machine status monitor thread for the |
8 | * voyager architecture. This allows us to monitor the machine | |
9 | * environment (temp, voltage, fan function) and the front panel and | |
10 | * internal UPS. If a fault is detected, this thread takes corrective | |
11 | * action (usually just informing init) | |
12 | * */ | |
13 | ||
14 | #include <linux/module.h> | |
1da177e4 LT |
15 | #include <linux/mm.h> |
16 | #include <linux/kernel_stat.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/mc146818rtc.h> | |
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/bootmem.h> | |
21 | #include <linux/kmod.h> | |
22 | #include <linux/completion.h> | |
23 | #include <linux/sched.h> | |
f3402a4e | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <asm/desc.h> |
26 | #include <asm/voyager.h> | |
27 | #include <asm/vic.h> | |
28 | #include <asm/mtrr.h> | |
29 | #include <asm/msr.h> | |
30 | ||
f3402a4e CH |
31 | struct task_struct *voyager_thread; |
32 | static __u8 set_timeout; | |
1da177e4 | 33 | |
a4ec1eff | 34 | static int execute(const char *string) |
1da177e4 LT |
35 | { |
36 | int ret; | |
37 | ||
38 | char *envp[] = { | |
39 | "HOME=/", | |
40 | "TERM=linux", | |
41 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
42 | NULL, | |
43 | }; | |
44 | char *argv[] = { | |
45 | "/bin/bash", | |
46 | "-c", | |
47 | (char *)string, | |
48 | NULL, | |
49 | }; | |
50 | ||
a4ec1eff IM |
51 | if ((ret = |
52 | call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC)) != 0) { | |
53 | printk(KERN_ERR "Voyager failed to run \"%s\": %i\n", string, | |
54 | ret); | |
1da177e4 LT |
55 | } |
56 | return ret; | |
57 | } | |
58 | ||
a4ec1eff | 59 | static void check_from_kernel(void) |
1da177e4 | 60 | { |
a4ec1eff IM |
61 | if (voyager_status.switch_off) { |
62 | ||
27b46d76 | 63 | /* FIXME: This should be configurable via proc */ |
1da177e4 | 64 | execute("umask 600; echo 0 > /etc/initrunlvl; kill -HUP 1"); |
a4ec1eff | 65 | } else if (voyager_status.power_fail) { |
1da177e4 | 66 | VDEBUG(("Voyager daemon detected AC power failure\n")); |
a4ec1eff | 67 | |
1da177e4 LT |
68 | /* FIXME: This should be configureable via proc */ |
69 | execute("umask 600; echo F > /etc/powerstatus; kill -PWR 1"); | |
70 | set_timeout = 1; | |
71 | } | |
72 | } | |
73 | ||
a4ec1eff | 74 | static void check_continuing_condition(void) |
1da177e4 | 75 | { |
a4ec1eff | 76 | if (voyager_status.power_fail) { |
1da177e4 | 77 | __u8 data; |
a4ec1eff | 78 | voyager_cat_psi(VOYAGER_PSI_SUBREAD, |
1da177e4 | 79 | VOYAGER_PSI_AC_FAIL_REG, &data); |
a4ec1eff | 80 | if ((data & 0x1f) == 0) { |
1da177e4 | 81 | /* all power restored */ |
a4ec1eff IM |
82 | printk(KERN_NOTICE |
83 | "VOYAGER AC power restored, cancelling shutdown\n"); | |
1da177e4 | 84 | /* FIXME: should be user configureable */ |
a4ec1eff IM |
85 | execute |
86 | ("umask 600; echo O > /etc/powerstatus; kill -PWR 1"); | |
1da177e4 LT |
87 | set_timeout = 0; |
88 | } | |
89 | } | |
90 | } | |
91 | ||
a4ec1eff | 92 | static int thread(void *unused) |
1da177e4 | 93 | { |
1da177e4 LT |
94 | printk(KERN_NOTICE "Voyager starting monitor thread\n"); |
95 | ||
f3402a4e CH |
96 | for (;;) { |
97 | set_current_state(TASK_INTERRUPTIBLE); | |
98 | schedule_timeout(set_timeout ? HZ : MAX_SCHEDULE_TIMEOUT); | |
99 | ||
1da177e4 | 100 | VDEBUG(("Voyager Daemon awoken\n")); |
a4ec1eff | 101 | if (voyager_status.request_from_kernel == 0) { |
1da177e4 LT |
102 | /* probably awoken from timeout */ |
103 | check_continuing_condition(); | |
104 | } else { | |
105 | check_from_kernel(); | |
106 | voyager_status.request_from_kernel = 0; | |
107 | } | |
1da177e4 LT |
108 | } |
109 | } | |
110 | ||
a4ec1eff | 111 | static int __init voyager_thread_start(void) |
f3402a4e CH |
112 | { |
113 | voyager_thread = kthread_run(thread, NULL, "kvoyagerd"); | |
114 | if (IS_ERR(voyager_thread)) { | |
a4ec1eff IM |
115 | printk(KERN_ERR |
116 | "Voyager: Failed to create system monitor thread.\n"); | |
f3402a4e CH |
117 | return PTR_ERR(voyager_thread); |
118 | } | |
119 | return 0; | |
120 | } | |
121 | ||
a4ec1eff | 122 | static void __exit voyager_thread_stop(void) |
1da177e4 | 123 | { |
f3402a4e | 124 | kthread_stop(voyager_thread); |
1da177e4 LT |
125 | } |
126 | ||
127 | module_init(voyager_thread_start); | |
f3402a4e | 128 | module_exit(voyager_thread_stop); |