watchdog: softdog: convert to watchdog core
Convert softdog.c to the new watchdog API. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
parent
a0f3683365
commit
a5132cafc0
|
@ -55,6 +55,7 @@ comment "Watchdog Device Drivers"
|
||||||
|
|
||||||
config SOFT_WATCHDOG
|
config SOFT_WATCHDOG
|
||||||
tristate "Software watchdog"
|
tristate "Software watchdog"
|
||||||
|
select WATCHDOG_CORE
|
||||||
help
|
help
|
||||||
A software monitoring watchdog. This will fail to reboot your system
|
A software monitoring watchdog. This will fail to reboot your system
|
||||||
from some situations that the hardware watchdog will recover
|
from some situations that the hardware watchdog will recover
|
||||||
|
|
|
@ -1,5 +1,5 @@
|
||||||
/*
|
/*
|
||||||
* SoftDog 0.07: A Software Watchdog Device
|
* SoftDog: A Software Watchdog Device
|
||||||
*
|
*
|
||||||
* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
|
* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
|
||||||
* All Rights Reserved.
|
* All Rights Reserved.
|
||||||
|
@ -44,17 +44,15 @@
|
||||||
#include <linux/timer.h>
|
#include <linux/timer.h>
|
||||||
#include <linux/miscdevice.h>
|
#include <linux/miscdevice.h>
|
||||||
#include <linux/watchdog.h>
|
#include <linux/watchdog.h>
|
||||||
#include <linux/fs.h>
|
|
||||||
#include <linux/notifier.h>
|
#include <linux/notifier.h>
|
||||||
#include <linux/reboot.h>
|
#include <linux/reboot.h>
|
||||||
#include <linux/init.h>
|
#include <linux/init.h>
|
||||||
#include <linux/jiffies.h>
|
#include <linux/jiffies.h>
|
||||||
#include <linux/uaccess.h>
|
|
||||||
#include <linux/kernel.h>
|
#include <linux/kernel.h>
|
||||||
|
|
||||||
#define TIMER_MARGIN 60 /* Default is 60 seconds */
|
#define TIMER_MARGIN 60 /* Default is 60 seconds */
|
||||||
static int soft_margin = TIMER_MARGIN; /* in seconds */
|
static unsigned int soft_margin = TIMER_MARGIN; /* in seconds */
|
||||||
module_param(soft_margin, int, 0);
|
module_param(soft_margin, uint, 0);
|
||||||
MODULE_PARM_DESC(soft_margin,
|
MODULE_PARM_DESC(soft_margin,
|
||||||
"Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="
|
"Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="
|
||||||
__MODULE_STRING(TIMER_MARGIN) ")");
|
__MODULE_STRING(TIMER_MARGIN) ")");
|
||||||
|
@ -65,16 +63,10 @@ MODULE_PARM_DESC(nowayout,
|
||||||
"Watchdog cannot be stopped once started (default="
|
"Watchdog cannot be stopped once started (default="
|
||||||
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||||
|
|
||||||
#ifdef ONLY_TESTING
|
|
||||||
static int soft_noboot = 1;
|
|
||||||
#else
|
|
||||||
static int soft_noboot = 0;
|
static int soft_noboot = 0;
|
||||||
#endif /* ONLY_TESTING */
|
|
||||||
|
|
||||||
module_param(soft_noboot, int, 0);
|
module_param(soft_noboot, int, 0);
|
||||||
MODULE_PARM_DESC(soft_noboot,
|
MODULE_PARM_DESC(soft_noboot,
|
||||||
"Softdog action, set to 1 to ignore reboots, 0 to reboot "
|
"Softdog action, set to 1 to ignore reboots, 0 to reboot (default=0)");
|
||||||
"(default depends on ONLY_TESTING)");
|
|
||||||
|
|
||||||
static int soft_panic;
|
static int soft_panic;
|
||||||
module_param(soft_panic, int, 0);
|
module_param(soft_panic, int, 0);
|
||||||
|
@ -89,9 +81,6 @@ static void watchdog_fire(unsigned long);
|
||||||
|
|
||||||
static struct timer_list watchdog_ticktock =
|
static struct timer_list watchdog_ticktock =
|
||||||
TIMER_INITIALIZER(watchdog_fire, 0, 0);
|
TIMER_INITIALIZER(watchdog_fire, 0, 0);
|
||||||
static unsigned long driver_open, orphan_timer;
|
|
||||||
static char expect_close;
|
|
||||||
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* If the timer expires..
|
* If the timer expires..
|
||||||
|
@ -99,9 +88,6 @@ static char expect_close;
|
||||||
|
|
||||||
static void watchdog_fire(unsigned long data)
|
static void watchdog_fire(unsigned long data)
|
||||||
{
|
{
|
||||||
if (test_and_clear_bit(0, &orphan_timer))
|
|
||||||
module_put(THIS_MODULE);
|
|
||||||
|
|
||||||
if (soft_noboot)
|
if (soft_noboot)
|
||||||
pr_crit("Triggered - Reboot ignored\n");
|
pr_crit("Triggered - Reboot ignored\n");
|
||||||
else if (soft_panic) {
|
else if (soft_panic) {
|
||||||
|
@ -118,126 +104,24 @@ static void watchdog_fire(unsigned long data)
|
||||||
* Softdog operations
|
* Softdog operations
|
||||||
*/
|
*/
|
||||||
|
|
||||||
static int softdog_keepalive(void)
|
static int softdog_ping(struct watchdog_device *w)
|
||||||
{
|
{
|
||||||
mod_timer(&watchdog_ticktock, jiffies+(soft_margin*HZ));
|
mod_timer(&watchdog_ticktock, jiffies+(w->timeout*HZ));
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
static int softdog_stop(void)
|
static int softdog_stop(struct watchdog_device *w)
|
||||||
{
|
{
|
||||||
del_timer(&watchdog_ticktock);
|
del_timer(&watchdog_ticktock);
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
static int softdog_set_heartbeat(int t)
|
static int softdog_set_timeout(struct watchdog_device *w, unsigned int t)
|
||||||
{
|
{
|
||||||
if ((t < 0x0001) || (t > 0xFFFF))
|
w->timeout = t;
|
||||||
return -EINVAL;
|
|
||||||
|
|
||||||
soft_margin = t;
|
|
||||||
return 0;
|
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 {
|
|
||||||
pr_crit("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 long softdog_ioctl(struct file *file, unsigned int cmd,
|
|
||||||
unsigned long arg)
|
|
||||||
{
|
|
||||||
void __user *argp = (void __user *)arg;
|
|
||||||
int __user *p = argp;
|
|
||||||
int new_margin;
|
|
||||||
static const struct watchdog_info ident = {
|
|
||||||
.options = WDIOF_SETTIMEOUT |
|
|
||||||
WDIOF_KEEPALIVEPING |
|
|
||||||
WDIOF_MAGICCLOSE,
|
|
||||||
.firmware_version = 0,
|
|
||||||
.identity = "Software Watchdog",
|
|
||||||
};
|
|
||||||
switch (cmd) {
|
|
||||||
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);
|
|
||||||
default:
|
|
||||||
return -ENOTTY;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Notifier for system down
|
* Notifier for system down
|
||||||
*/
|
*/
|
||||||
|
@ -247,7 +131,7 @@ static int softdog_notify_sys(struct notifier_block *this, unsigned long code,
|
||||||
{
|
{
|
||||||
if (code == SYS_DOWN || code == SYS_HALT)
|
if (code == SYS_DOWN || code == SYS_HALT)
|
||||||
/* Turn the WDT off */
|
/* Turn the WDT off */
|
||||||
softdog_stop();
|
softdog_stop(NULL);
|
||||||
return NOTIFY_DONE;
|
return NOTIFY_DONE;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -255,36 +139,44 @@ static int softdog_notify_sys(struct notifier_block *this, unsigned long code,
|
||||||
* Kernel Interfaces
|
* Kernel Interfaces
|
||||||
*/
|
*/
|
||||||
|
|
||||||
static const struct file_operations softdog_fops = {
|
|
||||||
.owner = THIS_MODULE,
|
|
||||||
.llseek = no_llseek,
|
|
||||||
.write = softdog_write,
|
|
||||||
.unlocked_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 = {
|
static struct notifier_block softdog_notifier = {
|
||||||
.notifier_call = softdog_notify_sys,
|
.notifier_call = softdog_notify_sys,
|
||||||
};
|
};
|
||||||
|
|
||||||
|
static struct watchdog_info softdog_info = {
|
||||||
|
.identity = "Software Watchdog",
|
||||||
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct watchdog_ops softdog_ops = {
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
.start = softdog_ping,
|
||||||
|
.stop = softdog_stop,
|
||||||
|
.ping = softdog_ping,
|
||||||
|
.set_timeout = softdog_set_timeout,
|
||||||
|
};
|
||||||
|
|
||||||
|
static struct watchdog_device softdog_dev = {
|
||||||
|
.info = &softdog_info,
|
||||||
|
.ops = &softdog_ops,
|
||||||
|
.min_timeout = 1,
|
||||||
|
.max_timeout = 0xFFFF
|
||||||
|
};
|
||||||
|
|
||||||
static int __init watchdog_init(void)
|
static int __init watchdog_init(void)
|
||||||
{
|
{
|
||||||
int ret;
|
int ret;
|
||||||
|
|
||||||
/* Check that the soft_margin value is within it's range;
|
/* Check that the soft_margin value is within it's range;
|
||||||
if not reset to the default */
|
if not reset to the default */
|
||||||
if (softdog_set_heartbeat(soft_margin)) {
|
if (soft_margin < 1 || soft_margin > 65535) {
|
||||||
softdog_set_heartbeat(TIMER_MARGIN);
|
|
||||||
pr_info("soft_margin must be 0 < soft_margin < 65536, using %d\n",
|
pr_info("soft_margin must be 0 < soft_margin < 65536, using %d\n",
|
||||||
TIMER_MARGIN);
|
TIMER_MARGIN);
|
||||||
|
return -EINVAL;
|
||||||
}
|
}
|
||||||
|
softdog_dev.timeout = soft_margin;
|
||||||
|
|
||||||
|
watchdog_set_nowayout(&softdog_dev, nowayout);
|
||||||
|
|
||||||
ret = register_reboot_notifier(&softdog_notifier);
|
ret = register_reboot_notifier(&softdog_notifier);
|
||||||
if (ret) {
|
if (ret) {
|
||||||
|
@ -292,15 +184,13 @@ static int __init watchdog_init(void)
|
||||||
return ret;
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
ret = misc_register(&softdog_miscdev);
|
ret = watchdog_register_device(&softdog_dev);
|
||||||
if (ret) {
|
if (ret) {
|
||||||
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
||||||
WATCHDOG_MINOR, ret);
|
|
||||||
unregister_reboot_notifier(&softdog_notifier);
|
unregister_reboot_notifier(&softdog_notifier);
|
||||||
return ret;
|
return ret;
|
||||||
}
|
}
|
||||||
|
|
||||||
pr_info("Software Watchdog Timer: 0.07 initialized. soft_noboot=%d soft_margin=%d sec soft_panic=%d (nowayout= %d)\n",
|
pr_info("Software Watchdog Timer: 0.08 initialized. soft_noboot=%d soft_margin=%d sec soft_panic=%d (nowayout=%d)\n",
|
||||||
soft_noboot, soft_margin, soft_panic, nowayout);
|
soft_noboot, soft_margin, soft_panic, nowayout);
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
|
@ -308,7 +198,7 @@ static int __init watchdog_init(void)
|
||||||
|
|
||||||
static void __exit watchdog_exit(void)
|
static void __exit watchdog_exit(void)
|
||||||
{
|
{
|
||||||
misc_deregister(&softdog_miscdev);
|
watchdog_unregister_device(&softdog_dev);
|
||||||
unregister_reboot_notifier(&softdog_notifier);
|
unregister_reboot_notifier(&softdog_notifier);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue