diff options
Diffstat (limited to 'drivers/char/watchdog/softdog.c')
| -rw-r--r-- | drivers/char/watchdog/softdog.c | 310 |
1 files changed, 0 insertions, 310 deletions
diff --git a/drivers/char/watchdog/softdog.c b/drivers/char/watchdog/softdog.c deleted file mode 100644 index 9c36949..0000000 --- a/drivers/char/watchdog/softdog.c +++ /dev/null @@ -1,310 +0,0 @@ -/* - * SoftDog 0.07: A Software Watchdog Device - * - * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. - * http://www.redhat.com - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide - * warranty for any of this software. This material is provided - * "AS-IS" and at no charge. - * - * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> - * - * Software only watchdog driver. Unlike its big brother the WDT501P - * driver this won't always recover a failed machine. - * - * 03/96: Angelo Haritsis <ah@doc.ic.ac.uk> : - * Modularised. - * Added soft_margin; use upon insmod to change the timer delay. - * NB: uses same minor as wdt (WATCHDOG_MINOR); we could use separate - * minors. - * - * 19980911 Alan Cox - * Made SMP safe for 2.3.x - * - * 20011127 Joel Becker (jlbec@evilplan.org> - * Added soft_noboot; Allows testing the softdog trigger without - * requiring a recompile. - * Added WDIOC_GETTIMEOUT and WDIOC_SETTIMOUT. - * - * 20020530 Joel Becker <joel.becker@oracle.com> - * Added Matt Domsch's nowayout module option. - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/timer.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/fs.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/jiffies.h> - -#include <asm/uaccess.h> - -#define PFX "SoftDog: " - -#define TIMER_MARGIN 60 /* Default is 60 seconds */ -static int soft_margin = TIMER_MARGIN; /* in seconds */ -module_param(soft_margin, int, 0); -MODULE_PARM_DESC(soft_margin, "Watchdog soft_margin in seconds. (0<soft_margin<65536, default=" __MODULE_STRING(TIMER_MARGIN) ")"); - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -#ifdef ONLY_TESTING -static int soft_noboot = 1; -#else -static int soft_noboot = 0; -#endif /* ONLY_TESTING */ - -module_param(soft_noboot, int, 0); -MODULE_PARM_DESC(soft_noboot, "Softdog action, set to 1 to ignore reboots, 0 to reboot (default depends on ONLY_TESTING)"); - -/* - * Our timer - */ - -static void watchdog_fire(unsigned long); - -static struct timer_list watchdog_ticktock = - TIMER_INITIALIZER(watchdog_fire, 0, 0); -static unsigned long driver_open, orphan_timer; -static char expect_close; - - -/* - * If the timer expires.. - */ - -static void watchdog_fire(unsigned long data) -{ - if (test_and_clear_bit(0, &orphan_timer)) - module_put(THIS_MODULE); - - if (soft_noboot) - printk(KERN_CRIT PFX "Triggered - Reboot ignored.\n"); - else - { - printk(KERN_CRIT PFX "Initiating system reboot.\n"); - emergency_restart(); - printk(KERN_CRIT PFX "Reboot didn't ?????\n"); - } -} - -/* - * Softdog operations - */ - -static int softdog_keepalive(void) -{ - mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ)); - return 0; -} - -static int softdog_stop(void) -{ - del_timer(&watchdog_ticktock); - return 0; -} - -static int softdog_set_heartbeat(int t) -{ - if ((t < 0x0001) || (t > 0xFFFF)) - return -EINVAL; - - soft_margin = t; - return 0; -} - -/* - * /dev/watchdog handling - */ - -static int softdog_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &driver_open)) - return -EBUSY; - if (!test_and_clear_bit(0, &orphan_timer)) - __module_get(THIS_MODULE); - /* - * Activate timer - */ - softdog_keepalive(); - return nonseekable_open(inode, file); -} - -static int softdog_release(struct inode *inode, struct file *file) -{ - /* - * Shut off the timer. - * Lock it in if it's a module and we set nowayout - */ - if (expect_close == 42) { - softdog_stop(); - module_put(THIS_MODULE); - } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); - set_bit(0, &orphan_timer); - softdog_keepalive(); - } - clear_bit(0, &driver_open); - expect_close = 0; - return 0; -} - -static ssize_t softdog_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) -{ - /* - * Refresh the timer. - */ - if(len) { - if (!nowayout) { - size_t i; - - /* In case it was set long ago */ - expect_close = 0; - - for (i = 0; i != len; i++) { - char c; - - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - softdog_keepalive(); - } - return len; -} - -static int softdog_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - int new_margin; - static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, - .firmware_version = 0, - .identity = "Software Watchdog", - }; - switch (cmd) { - default: - return -ENOTTY; - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, - sizeof(ident)) ? -EFAULT : 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - return put_user(0, p); - case WDIOC_KEEPALIVE: - softdog_keepalive(); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(new_margin, p)) - return -EFAULT; - if (softdog_set_heartbeat(new_margin)) - return -EINVAL; - softdog_keepalive(); - /* Fall */ - case WDIOC_GETTIMEOUT: - return put_user(soft_margin, p); - } -} - -/* - * Notifier for system down - */ - -static int softdog_notify_sys(struct notifier_block *this, unsigned long code, - void *unused) -{ - if(code==SYS_DOWN || code==SYS_HALT) { - /* Turn the WDT off */ - softdog_stop(); - } - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations softdog_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = softdog_write, - .ioctl = softdog_ioctl, - .open = softdog_open, - .release = softdog_release, -}; - -static struct miscdevice softdog_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &softdog_fops, -}; - -static struct notifier_block softdog_notifier = { - .notifier_call = softdog_notify_sys, -}; - -static char banner[] __initdata = KERN_INFO "Software Watchdog Timer: 0.07 initialized. soft_noboot=%d soft_margin=%d sec (nowayout= %d)\n"; - -static int __init watchdog_init(void) -{ - int ret; - - /* Check that the soft_margin value is within it's range ; if not reset to the default */ - if (softdog_set_heartbeat(soft_margin)) { - softdog_set_heartbeat(TIMER_MARGIN); - printk(KERN_INFO PFX "soft_margin value must be 0<soft_margin<65536, using %d\n", - TIMER_MARGIN); - } - - ret = register_reboot_notifier(&softdog_notifier); - if (ret) { - printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); - return ret; - } - - ret = misc_register(&softdog_miscdev); - if (ret) { - printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - unregister_reboot_notifier(&softdog_notifier); - return ret; - } - - printk(banner, soft_noboot, soft_margin, nowayout); - - return 0; -} - -static void __exit watchdog_exit(void) -{ - misc_deregister(&softdog_miscdev); - unregister_reboot_notifier(&softdog_notifier); -} - -module_init(watchdog_init); -module_exit(watchdog_exit); - -MODULE_AUTHOR("Alan Cox"); -MODULE_DESCRIPTION("Software Watchdog Device Driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |