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Commit 6582e43d authored by Wim Van Sebroeck's avatar Wim Van Sebroeck
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[WATCHDOG] v2.6.5-rc2 softdog.c-patch 

Version 0.07 of softdog.c - Changes that were made are:
* Extract the start/keepalive code in a seperate function (softdog_keepalive)
* Extract the stop code in a seperate function (softdog_stop)
* Add notifier support
* Extract softdog_set_heartbeat code to seperate subroutine
* Small clean-up's
parent 94147016
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Showing with 105 additions and 32 deletions
drivers/char/watchdog/softdog.c
View file @ 6582e43d
/*
* SoftDog 0.06: A Software Watchdog Device
* SoftDog 0.07: A Software Watchdog Device
*
* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
* http://www.redhat.com
......@@ -40,26 +40,21 @@
#include <linux/moduleparam.h>
#include <linux/config.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 <asm/uaccess.h>
#define TIMER_MARGIN 60 /* (secs) Default is 1 minute */
#define PFX "SoftDog: "
static char expect_close;
#define TIMER_MARGIN 60 /* Default is 60 seconds */
static int soft_margin = TIMER_MARGIN; /* in seconds */
#ifdef ONLY_TESTING
static int soft_noboot = 1;
#else
static int soft_noboot = 0;
#endif /* ONLY_TESTING */
module_param(soft_margin, int, 0);
module_param(soft_noboot, int, 0);
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(soft_margin, "Watchdog soft_margin in seconds. (0<soft_margin<65536, default=" __MODULE_STRING(TIMER_MARGIN) ")");
#ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1;
......@@ -70,6 +65,15 @@ static int nowayout = 0;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_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
*/
......@@ -79,6 +83,7 @@ static void watchdog_fire(unsigned long);
static struct timer_list watchdog_ticktock =
TIMER_INITIALIZER(watchdog_fire, 0, 0);
static unsigned long timer_alive;
static char expect_close;
/*
......@@ -88,17 +93,42 @@ static unsigned long timer_alive;
static void watchdog_fire(unsigned long data)
{
if (soft_noboot)
printk(KERN_CRIT "SOFTDOG: Triggered - Reboot ignored.\n");
printk(KERN_CRIT PFX "Triggered - Reboot ignored.\n");
else
{
printk(KERN_CRIT "SOFTDOG: Initiating system reboot.\n");
printk(KERN_CRIT PFX "Initiating system reboot.\n");
machine_restart(NULL);
printk("SOFTDOG: Reboot didn't ?????\n");
printk(KERN_CRIT PFX "Reboot didn't ?????\n");
}
}
/*
* Allow only one person to hold it open
* 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)
......@@ -110,7 +140,7 @@ static int softdog_open(struct inode *inode, struct file *file)
/*
* Activate timer
*/
mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ));
softdog_keepalive();
return 0;
}
......@@ -121,9 +151,10 @@ static int softdog_release(struct inode *inode, struct file *file)
* Lock it in if it's a module and we set nowayout
*/
if (expect_close == 42) {
del_timer(&watchdog_ticktock);
softdog_stop();
} else {
printk(KERN_CRIT "SOFTDOG: WDT device closed unexpectedly. WDT will not stop!\n");
printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
softdog_keepalive();
}
clear_bit(0, &timer_alive);
expect_close = 0;
......@@ -155,7 +186,7 @@ static ssize_t softdog_write(struct file *file, const char *data, size_t len, lo
expect_close = 42;
}
}
mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ));
softdog_keepalive();
}
return len;
}
......@@ -165,37 +196,57 @@ static int softdog_ioctl(struct inode *inode, struct file *file,
{
int new_margin;
static struct watchdog_info ident = {
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.identity = "Software Watchdog",
.options = WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING |
WDIOF_MAGICCLOSE,
.firmware_version = 0,
.identity = "Software Watchdog",
};
switch (cmd) {
default:
return -ENOIOCTLCMD;
case WDIOC_GETSUPPORT:
if(copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)))
return -EFAULT;
return 0;
return copy_to_user((struct watchdog_info *)arg, &ident,
sizeof(ident)) ? -EFAULT : 0;
case WDIOC_GETSTATUS:
case WDIOC_GETBOOTSTATUS:
return put_user(0,(int *)arg);
case WDIOC_KEEPALIVE:
mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ));
softdog_keepalive();
return 0;
case WDIOC_SETTIMEOUT:
if (get_user(new_margin, (int *)arg))
return -EFAULT;
if (new_margin < 1)
if (softdog_set_heartbeat(new_margin))
return -EINVAL;
soft_margin = new_margin;
mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ));
softdog_keepalive();
/* Fall */
case WDIOC_GETTIMEOUT:
return put_user(soft_margin, (int *)arg);
}
}
/*
* 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 struct file_operations softdog_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.write = softdog_write,
.ioctl = softdog_ioctl,
.open = softdog_open,
......@@ -208,18 +259,39 @@ static struct miscdevice softdog_miscdev = {
.fops = &softdog_fops,
};
static char banner[] __initdata = KERN_INFO "Software Watchdog Timer: 0.06, soft_margin: %d sec, nowayout: %d\n";
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;
ret = misc_register(&softdog_miscdev);
/* 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);
}
if (ret)
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_margin, nowayout);
printk(banner, soft_noboot, soft_margin, nowayout);
return 0;
}
......@@ -227,6 +299,7 @@ static int __init watchdog_init(void)
static void __exit watchdog_exit(void)
{
misc_deregister(&softdog_miscdev);
unregister_reboot_notifier(&softdog_notifier);
}
module_init(watchdog_init);
......
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