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Subject[CFT][PATCH] watchdog nowayout and timeout module parameters
I needed a way to set the software watchdog timer to use a runtime-set
"no way out" value instead of only CONFIG_WATCHDOG_NOWAYOUT. Rather
than modify only softdog.o, Alan Cox suggested I modify all the watchdog
drivers. Accordingly, the patch is below and posted to
http://domsch.com/linux/patches/linux-2.4.17-rc1-watchdog-nowayout-20011
217.patch. I'm cc:ing all the listed maintainers. Please respond to me
privately with your approval or suggested changes per driver. I don't
have any of this hardware to test with myself.

Most drivers were modified to add a 'nowayout=[01]' module parameter
which defaults to CONFIG_WATCHDOG_NOWAYOUT if not passed. wdt285.c
wasn't written to allow a way out at all, so it wasn't modified.

To the following drivers was also added a 'timeout=X' module parameter,
where timeout is specified in seconds. Only drivers for which no
similar parm was already present were modified:
advantechwdt.c (marekm@linux.org.pl)
eurotechwdt.c (giometti@ascensit.com, support@ascensit.com)
ib700wdt.c (chowes@vsol.net)
pcwd.c (kenji@bitgate.com)
wdt.c (alan@redhat.com)
wdt_pci.c (alan@redhat.com)

These already offer a timeout parm:
i810-tco.c (nils@kernelconcepts.de)
softdog.c (alan@redhat.com)
wdt285.o (pb@nexus.co.uk)

These didn't get a timeout parm because it wasn't obvious if or how it
could be done:
machzwd.c (fuganti@conectiva.com.br)
mixcomwd.c (gorgo@itc.hu, info@itc.hu)
shwdt.c (lethal@chaoticdreams.org)
wdt977.c (woody@netwinder.org)


Thanks,
Matt

--
Matt Domsch
Sr. Software Engineer
Dell Linux Solutions www.dell.com/linux
#1 US Linux Server provider with 24% (IDC Sept 2001)
#2 Worldwide Linux Server provider with 17% (IDC Sept 2001)
#3 Unix provider with 18% in the US (Dataquest)!


diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/acquirewdt.c linux/drivers/char/acquirewdt.c
--- linux-2.4.17-rc1/drivers/char/acquirewdt.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/acquirewdt.c Mon Dec 17 11:39:51 2001
@@ -17,6 +17,9 @@
*
* (c) Copyright 1995 Alan Cox <alan@redhat.com>
*
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ * Can't add timeout - driver doesn't allow changing value
*/

#include <linux/config.h>
@@ -50,8 +53,14 @@ static spinlock_t acq_lock;
#define WDT_STOP 0x43
#define WDT_START 0x443

-#define WD_TIMO (100*60) /* 1 minute */
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif

+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");

/*
* Kernel methods.
@@ -126,10 +135,12 @@ static int acq_open(struct inode *inode,
spin_unlock(&acq_lock);
return -EBUSY;
}
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate
*/
-
acq_is_open=1;
inb_p(WDT_START);
spin_unlock(&acq_lock);
@@ -145,9 +156,9 @@ static int acq_close(struct inode *inode
if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
{
spin_lock(&acq_lock);
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
inb_p(WDT_STOP);
-#endif
+ }
acq_is_open=0;
spin_unlock(&acq_lock);
}
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/advantechwdt.c linux/drivers/char/advantechwdt.c
--- linux-2.4.17-rc1/drivers/char/advantechwdt.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/advantechwdt.c Mon Dec 17 11:40:00 2001
@@ -20,6 +20,9 @@
*
* (c) Copyright 1995 Alan Cox <alan@redhat.com>
*
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ * Added timeout module option to override default
*/

#include <linux/config.h>
@@ -56,8 +59,7 @@ static spinlock_t advwdt_lock;
* the manual says WDT_STOP is 0x43, not 0x443).
* (0x43 is also a write-only control register for the 8254 timer!)
*
- * TODO: module parameters to set the I/O port addresses and NOWAYOUT
- * option at load time.
+ * TODO: module parameters to set the I/O port addresses
*/

#define WDT_STOP 0x443
@@ -65,6 +67,19 @@ static spinlock_t advwdt_lock;

#define WD_TIMO 60 /* 1 minute */

+static int timeout = WD_TIMO; /* in seconds */
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=60)");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
/*
* Kernel methods.
*/
@@ -73,7 +88,7 @@ static void
advwdt_ping(void)
{
/* Write a watchdog value */
- outb_p(WD_TIMO, WDT_START);
+ outb_p(timeout, WDT_START);
}

static ssize_t
@@ -135,6 +150,9 @@ advwdt_open(struct inode *inode, struct
spin_unlock(&advwdt_lock);
return -EBUSY;
}
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate
*/
@@ -154,9 +172,9 @@ advwdt_close(struct inode *inode, struct
lock_kernel();
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
spin_lock(&advwdt_lock);
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
inb_p(WDT_STOP);
-#endif
+ }
advwdt_is_open = 0;
spin_unlock(&advwdt_lock);
}
@@ -209,11 +227,21 @@ static struct notifier_block advwdt_noti
0
};

+static void __init
+advwdt_validate_timeout(void)
+{
+ if (timeout < 1 || timeout > 63) {
+ timeout = WD_TIMO;
+ printk(KERN_INFO "advantechwdt: timeout value must be 1 <= x <= 63, using %d\n", timeout);
+ }
+}
+
static int __init
advwdt_init(void)
{
printk("WDT driver for Advantech single board computer initialising.\n");

+ advwdt_validate_timeout();
spin_lock_init(&advwdt_lock);
misc_register(&advwdt_miscdev);
#if WDT_START != WDT_STOP
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/eurotechwdt.c linux/drivers/char/eurotechwdt.c
--- linux-2.4.17-rc1/drivers/char/eurotechwdt.c Thu Oct 25 15:53:47 2001
+++ linux/drivers/char/eurotechwdt.c Mon Dec 17 11:41:11 2001
@@ -20,6 +20,10 @@
* "AS-IS" and at no charge.
*
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>*
+ *
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ * Added timeout module option to override default
*/

#include <linux/config.h>
@@ -45,7 +49,6 @@
#include <linux/smp_lock.h>

static int eurwdt_is_open;
-static int eurwdt_timeout;
static spinlock_t eurwdt_lock;

/*
@@ -58,6 +61,18 @@ static int irq = 10;
static char *ev = "int";

#define WDT_TIMEOUT 60 /* 1 minute */
+static int timeout = WDT_TIMEOUT;
+
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Eurotech WDT timeout in seconds (default=60)");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");


/*
@@ -116,6 +131,15 @@ MODULE_PARM_DESC(ev, "Eurotech WDT event
* Programming support
*/

+static void __init eurwdt_validate_timeout(void)
+{
+ if (timeout < 0 || timeout > 255) {
+ timeout = WDT_TIMEOUT;
+ printk(KERN_INFO "eurwdt: timeout must be 0 < x < 255, using %d\n",
+ timeout);
+ }
+}
+
static inline void eurwdt_write_reg(u8 index, u8 data)
{
outb(index, io);
@@ -189,7 +213,7 @@ void eurwdt_interrupt(int irq, void *dev
static void eurwdt_ping(void)
{
/* Write the watchdog default value */
- eurwdt_set_timeout(eurwdt_timeout);
+ eurwdt_set_timeout(timeout);
}

/**
@@ -263,7 +287,7 @@ static int eurwdt_ioctl(struct inode *in
if (time < 0 || time > 255)
return -EINVAL;

- eurwdt_timeout = time;
+ timeout = time;
eurwdt_set_timeout(time);
return 0;
}
@@ -287,9 +311,11 @@ static int eurwdt_open(struct inode *ino
spin_unlock(&eurwdt_lock);
return -EBUSY;
}
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }

eurwdt_is_open = 1;
- eurwdt_timeout = WDT_TIMEOUT; /* initial timeout */

/* Activate the WDT */
eurwdt_activate_timer();
@@ -323,14 +349,13 @@ static int eurwdt_open(struct inode *ino
static int eurwdt_release(struct inode *inode, struct file *file)
{
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
eurwdt_disable_timer();
-#endif
+ }
eurwdt_is_open = 0;

MOD_DEC_USE_COUNT;
}
-
return 0;
}

@@ -423,6 +448,8 @@ static int __init eurwdt_init(void)
{
int ret;

+ eurwdt_validate_timeout();
+
ret = misc_register(&eurwdt_miscdev);
if (ret) {
printk(KERN_ERR "eurwdt: can't misc_register on minor=%d\n",
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/i810-tco.c linux/drivers/char/i810-tco.c
--- linux-2.4.17-rc1/drivers/char/i810-tco.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/i810-tco.c Mon Dec 17 11:41:40 2001
@@ -1,5 +1,5 @@
/*
- * i810-tco 0.02: TCO timer driver for i810 chipsets
+ * i810-tco 0.03: TCO timer driver for i810 chipsets
*
* (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights Reserved.
* http://www.kernelconcepts.de
@@ -28,6 +28,9 @@
* Initial Version 0.01
* 20000728 Nils Faerber
* 0.02 Fix for SMI_EN->TCO_EN bit, some cleanups
+ * 20011214 Matt Domsch <Matt_Domsch@dell.com>
+ * 0.03 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ * Didn't add timeout option as i810_margin already exists.
*/

#include <linux/module.h>
@@ -60,6 +63,18 @@ static spinlock_t tco_lock; /* Guards th
static int i810_margin = TIMER_MARGIN; /* steps of 0.6sec */

MODULE_PARM (i810_margin, "i");
+MODULE_PARM_DESC(i810_margin, "Watchdog timeout in steps of 0.6sec, 2<n<64. Default = 50 (30 seconds)");
+
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+

/*
* Timer active flag
@@ -167,6 +182,9 @@ static int i810tco_open (struct inode *i
if (timer_alive)
return -EBUSY;

+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Reload and activate timer
*/
@@ -181,10 +199,10 @@ static int i810tco_release (struct inode
/*
* Shut off the timer.
*/
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
tco_timer_stop ();
timer_alive = 0;
-#endif
+ }
return 0;
}

@@ -342,8 +360,8 @@ static int __init watchdog_init (void)
tco_timer_reload ();

printk (KERN_INFO
- "i810 TCO timer: V0.02, timer margin: %d sec (0x%04x)\n",
- (int) (i810_margin * 6 / 10), TCOBASE);
+ "i810 TCO timer: V0.03, timer margin: %d sec (0x%04x), nowayout: %d\n",
+ (int) (i810_margin * 6 / 10), TCOBASE, nowayout);
return 0;
}

diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/ib700wdt.c linux/drivers/char/ib700wdt.c
--- linux-2.4.17-rc1/drivers/char/ib700wdt.c Thu Oct 11 11:07:00 2001
+++ linux/drivers/char/ib700wdt.c Mon Dec 17 11:42:26 2001
@@ -25,6 +25,10 @@
*
* (c) Copyright 1995 Alan Cox <alan@redhat.com>
*
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ * Added timeout module option to override default
+ *
*/

#include <linux/config.h>
@@ -92,15 +96,36 @@ static spinlock_t ibwdt_lock;

#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */

+static int timeout_val = WD_TIMO; /* value in table */
+static int timeout = 30; /* in seconds */
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, 0 < n < 30, must be even (default=30)");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
/*
* Kernel methods.
*/

+static void __init
+ibwdt_validate_timeout(void)
+{
+ timeout_val = (30 - timeout) / 2;
+ if (timeout_val < 0 || timeout_val > 0xF) timeout_val = WD_TIMO;
+}
+
static void
ibwdt_ping(void)
{
/* Write a watchdog value */
- outb_p(WD_TIMO, WDT_START);
+ outb_p(timeout_val, WDT_START);
}

static ssize_t
@@ -162,6 +187,9 @@ ibwdt_open(struct inode *inode, struct f
spin_unlock(&ibwdt_lock);
return -EBUSY;
}
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate
*/
@@ -181,9 +209,9 @@ ibwdt_close(struct inode *inode, struct
lock_kernel();
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
spin_lock(&ibwdt_lock);
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
- outb_p(WD_TIMO, WDT_STOP);
-#endif
+ if (!nowayout) {
+ outb_p(timeout_val, WDT_STOP);
+ }
ibwdt_is_open = 0;
spin_unlock(&ibwdt_lock);
}
@@ -201,7 +229,7 @@ ibwdt_notify_sys(struct notifier_block *
{
if (code == SYS_DOWN || code == SYS_HALT) {
/* Turn the WDT off */
- outb_p(WD_TIMO, WDT_STOP);
+ outb_p(timeout_val, WDT_STOP);
}
return NOTIFY_DONE;
}
@@ -241,6 +269,7 @@ ibwdt_init(void)
{
printk("WDT driver for IB700 single board computer initialising.\n");

+ ibwdt_validate_timeout();
spin_lock_init(&ibwdt_lock);
misc_register(&ibwdt_miscdev);
#if WDT_START != WDT_STOP
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/machzwd.c linux/drivers/char/machzwd.c
--- linux-2.4.17-rc1/drivers/char/machzwd.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/machzwd.c Mon Dec 17 11:23:31 2001
@@ -24,6 +24,8 @@
* a system RESET and it starts wd#2 that unconditionaly will RESET
* the system when the counter reaches zero.
*
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*/

#include <linux/config.h>
@@ -103,6 +105,16 @@ MODULE_LICENSE("GPL");
MODULE_PARM(action, "i");
MODULE_PARM_DESC(action, "after watchdog resets, generate: 0 = RESET(*) 1 = SMI 2 = NMI 3 = SCI");

+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+
#define PFX "machzwd"

static struct watchdog_info zf_info = {
@@ -307,7 +319,7 @@ static ssize_t zf_write(struct file *fil
* no need to check for close confirmation
* no way to disable watchdog ;)
*/
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
size_t ofs;

/*
@@ -323,7 +335,7 @@ static ssize_t zf_write(struct file *fil
dprintk("zf_expect_close 1\n");
}
}
-#endif
+ }
/*
* Well, anyhow someone wrote to us,
* we should return that favour
@@ -386,9 +398,9 @@ static int zf_open(struct inode *inode,
return -EBUSY;
}

-#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
MOD_INC_USE_COUNT;
-#endif
+ }
zf_is_open = 1;

spin_unlock(&zf_lock);
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/mixcomwd.c linux/drivers/char/mixcomwd.c
--- linux-2.4.17-rc1/drivers/char/mixcomwd.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/mixcomwd.c Mon Dec 17 11:44:09 2001
@@ -28,9 +28,12 @@
* Version 0.4 (99/11/15):
* - support for one more type board
*
+ * Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
+ * - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *
*/

-#define VERSION "0.4"
+#define VERSION "0.5"

#include <linux/module.h>
#include <linux/config.h>
@@ -57,26 +60,30 @@ static int mixcomwd_ioports[] = { 0x180,
static long mixcomwd_opened; /* long req'd for setbit --RR */

static int watchdog_port;
-
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
static int mixcomwd_timer_alive;
static struct timer_list mixcomwd_timer;
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
#endif

+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
static void mixcomwd_ping(void)
{
outb_p(55,watchdog_port);
return;
}

-#ifndef CONFIG_WATCHDOG_NOWAYOUT
static void mixcomwd_timerfun(unsigned long d)
{
mixcomwd_ping();

mod_timer(&mixcomwd_timer,jiffies+ 5*HZ);
}
-#endif

/*
* Allow only one person to hold it open
@@ -89,12 +96,14 @@ static int mixcomwd_open(struct inode *i
}
mixcomwd_ping();

-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ } else {
if(mixcomwd_timer_alive) {
del_timer(&mixcomwd_timer);
mixcomwd_timer_alive=0;
}
-#endif
+ }
return 0;
}

@@ -102,7 +111,7 @@ static int mixcomwd_release(struct inode
{

lock_kernel();
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
if(mixcomwd_timer_alive) {
printk(KERN_ERR "mixcomwd: release called while internal timer alive");
unlock_kernel();
@@ -114,7 +123,7 @@ static int mixcomwd_release(struct inode
mixcomwd_timer.data=0;
mixcomwd_timer_alive=1;
add_timer(&mixcomwd_timer);
-#endif
+ }

clear_bit(0,&mixcomwd_opened);
unlock_kernel();
@@ -148,9 +157,9 @@ static int mixcomwd_ioctl(struct inode *
{
case WDIOC_GETSTATUS:
status=mixcomwd_opened;
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
status|=mixcomwd_timer_alive;
-#endif
+ }
if (copy_to_user((int *)arg, &status, sizeof(int))) {
return -EFAULT;
}
@@ -255,14 +264,14 @@ static int __init mixcomwd_init(void)

static void __exit mixcomwd_exit(void)
{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
if(mixcomwd_timer_alive) {
printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
" probably reboot!\n");
del_timer(&mixcomwd_timer);
mixcomwd_timer_alive=0;
}
-#endif
+ }
release_region(watchdog_port,1);
misc_deregister(&mixcomwd_miscdev);
}
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/pcwd.c linux/drivers/char/pcwd.c
--- linux-2.4.17-rc1/drivers/char/pcwd.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/pcwd.c Mon Dec 17 11:45:36 2001
@@ -40,6 +40,8 @@
* fairly useless proc entry.
* 990610 removed said useless proc code for the merge <alan>
* 000403 Removed last traces of proc code. <davej>
+ * 011214 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
+ * Added timeout module option to override default
*/

#include <linux/module.h>
@@ -76,7 +78,7 @@
*/
static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };

-#define WD_VER "1.10 (06/05/99)"
+#define WD_VER "1.12 (12/14/2001)"

/*
* It should be noted that PCWD_REVISION_B was removed because A and B
@@ -88,7 +90,22 @@ static int pcwd_ioports[] = { 0x270, 0x3
#define PCWD_REVISION_A 1
#define PCWD_REVISION_C 2

-#define WD_TIMEOUT 3 /* 1 1/2 seconds for a timeout */
+#define WD_TIMEOUT 4 /* 2 seconds for a timeout */
+static int timeout_val = WD_TIMEOUT;
+static int timeout = 2;
+
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=2)");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+

/*
* These are the defines for the PC Watchdog card, revision A.
@@ -126,7 +143,7 @@ static int __init pcwd_checkcard(void)
if (prev_card_dat == 0xFF)
return 0;

- while(count < WD_TIMEOUT) {
+ while(count < timeout_val) {

/* Read the raw card data from the port, and strip off the
first 4 bits */
@@ -454,7 +471,7 @@ static int pcwd_close(struct inode *ino,
{
lock_kernel();
is_open = 0;
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
/* Disable the board */
if (revision == PCWD_REVISION_C) {
spin_lock(&io_lock);
@@ -462,7 +479,7 @@ static int pcwd_close(struct inode *ino,
outb_p(0xA5, current_readport + 3);
spin_unlock(&io_lock);
}
-#endif
+ }
unlock_kernel();
}
return 0;
@@ -564,9 +581,15 @@ static struct miscdevice temp_miscdev =
&pcwd_fops
};

+static void __init pcwd_validate_timeout(void)
+{
+ timeout_val = timeout * 2;
+}
+
static int __init pcwatchdog_init(void)
{
int i, found = 0;
+ pcwd_validate_timeout();
spin_lock_init(&io_lock);

revision = PCWD_REVISION_A;
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/sbc60xxwdt.c linux/drivers/char/sbc60xxwdt.c
--- linux-2.4.17-rc1/drivers/char/sbc60xxwdt.c Thu Sep 13 17:21:32 2001
+++ linux/drivers/char/sbc60xxwdt.c Mon Dec 17 11:45:54 2001
@@ -109,6 +109,15 @@ static unsigned long next_heartbeat;
static int wdt_is_open;
static int wdt_expect_close;

+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
/*
* Whack the dog
*/
@@ -202,6 +211,9 @@ static int fop_open(struct inode * inode
/* Just in case we're already talking to someone... */
if(wdt_is_open)
return -EBUSY;
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/* Good, fire up the show */
wdt_is_open = 1;
wdt_startup();
@@ -217,7 +229,7 @@ static int fop_close(struct inode * inod
lock_kernel();
if(MINOR(inode->i_rdev) == WATCHDOG_MINOR)
{
- if(wdt_expect_close)
+ if(wdt_expect_close && !nowayout)
wdt_turnoff();
else {
del_timer(&timer);
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/shwdt.c linux/drivers/char/shwdt.c
--- linux-2.4.17-rc1/drivers/char/shwdt.c Mon Oct 15 15:36:48 2001
+++ linux/drivers/char/shwdt.c Mon Dec 17 11:46:24 2001
@@ -9,6 +9,9 @@
* 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.
+ *
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*/

#include <linux/config.h>
@@ -61,6 +64,15 @@
static int sh_is_open = 0;
static struct watchdog_info sh_wdt_info;

+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
/**
* sh_wdt_write_cnt - Write to Counter
*
@@ -137,6 +149,9 @@ static int sh_wdt_open(struct inode *ino
if (sh_is_open) {
return -EBUSY;
}
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }

sh_is_open = 1;
sh_wdt_start();
@@ -162,9 +177,9 @@ static int sh_wdt_close(struct inode *in
lock_kernel();

if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
sh_wdt_stop();
-#endif
+ }
sh_is_open = 0;
}

diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/softdog.c linux/drivers/char/softdog.c
--- linux-2.4.17-rc1/drivers/char/softdog.c Sun Sep 30 14:26:05 2001
+++ linux/drivers/char/softdog.c Mon Dec 17 10:12:29 2001
@@ -1,5 +1,5 @@
/*
- * SoftDog 0.05: A Software Watchdog Device
+ * SoftDog 0.06: A Software Watchdog Device
*
* (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
* http://www.redhat.com
@@ -26,6 +26,10 @@
*
* 19980911 Alan Cox
* Made SMP safe for 2.3.x
+ *
+ * 20011214 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ * Didn't add timeout option, as soft_margin option already exists.
*/

#include <linux/module.h>
@@ -46,6 +50,15 @@
static int soft_margin = TIMER_MARGIN; /* in seconds */

MODULE_PARM(soft_margin,"i");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
MODULE_LICENSE("GPL");

/*
@@ -83,9 +96,9 @@ static int softdog_open(struct inode *in
{
if(timer_alive)
return -EBUSY;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
MOD_INC_USE_COUNT;
-#endif
+ }
/*
* Activate timer
*/
@@ -98,12 +111,12 @@ static int softdog_release(struct inode
{
/*
* Shut off the timer.
- * Lock it in if it's a module and we defined ...NOWAYOUT
+ * Lock it in if it's a module and we set nowayout
*/
lock_kernel();
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if(!nowayout) {
del_timer(&watchdog_ticktock);
-#endif
+ }
timer_alive=0;
unlock_kernel();
return 0;
@@ -161,7 +174,7 @@ static struct miscdevice softdog_miscdev
fops: &softdog_fops,
};

-static char banner[] __initdata = KERN_INFO "Software Watchdog Timer: 0.05, timer margin: %d sec\n";
+static char banner[] __initdata = KERN_INFO "Software Watchdog Timer: 0.06, soft_margin: %d sec, nowayout: %d\n";

static int __init watchdog_init(void)
{
@@ -172,7 +185,7 @@ static int __init watchdog_init(void)
if (ret)
return ret;

- printk(banner, soft_margin);
+ printk(banner, soft_margin, nowayout);

return 0;
}
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/wdt.c linux/drivers/char/wdt.c
--- linux-2.4.17-rc1/drivers/char/wdt.c Fri Sep 7 11:28:38 2001
+++ linux/drivers/char/wdt.c Mon Dec 17 11:47:30 2001
@@ -15,7 +15,7 @@
*
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
*
- * Release 0.08.
+ * Release 0.09.
*
* Fixes
* Dave Gregorich : Modularisation and minor bugs
@@ -27,6 +27,7 @@
* Tim Hockin : Added insmod parameters, comment cleanup
* Parameterized timeout
* Tigran Aivazian : Restructured wdt_init() to handle failures
+ * Matt Domsch : added nowayout and timeout module options
*/

#include <linux/config.h>
@@ -62,6 +63,26 @@ static int irq=11;

#define WD_TIMO (100*60) /* 1 minute */

+static int timeout_val = WD_TIMO; /* value passed to card */
+static int timeout = 60; /* in seconds */
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=60)");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+static void __init
+wdt_validate_timeout(void)
+{
+ timeout_val = timeout * 100;
+}
+
#ifndef MODULE

/**
@@ -216,7 +237,7 @@ static void wdt_ping(void)
/* Write a watchdog value */
inb_p(WDT_DC);
wdt_ctr_mode(1,2);
- wdt_ctr_load(1,WD_TIMO); /* Timeout */
+ wdt_ctr_load(1,timeout_val); /* Timeout */
outb_p(0, WDT_DC);
}

@@ -339,6 +360,9 @@ static int wdt_open(struct inode *inode,
case WATCHDOG_MINOR:
if(wdt_is_open)
return -EBUSY;
+ if (nowayout) {
+ MOD_INC_USE_COUNT;
+ }
/*
* Activate
*/
@@ -349,7 +373,7 @@ static int wdt_open(struct inode *inode,
wdt_ctr_mode(1,2);
wdt_ctr_mode(2,0);
wdt_ctr_load(0, 8948); /* count at 100Hz */
- wdt_ctr_load(1,WD_TIMO); /* Timeout 120 seconds */
+ wdt_ctr_load(1,timeout_val); /* Timeout */
wdt_ctr_load(2,65535);
outb_p(0, WDT_DC); /* Enable */
return 0;
@@ -377,10 +401,10 @@ static int wdt_release(struct inode *ino
lock_kernel();
if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
{
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
inb_p(WDT_DC); /* Disable counters */
wdt_ctr_load(2,0); /* 0 length reset pulses now */
-#endif
+ }
wdt_is_open=0;
}
unlock_kernel();
@@ -487,6 +511,7 @@ static int __init wdt_init(void)
{
int ret;

+ wdt_validate_timeout();
ret = misc_register(&wdt_miscdev);
if (ret) {
printk(KERN_ERR "wdt: can't misc_register on minor=%d\n", WATCHDOG_MINOR);
diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/wdt977.c linux/drivers/char/wdt977.c
--- linux-2.4.17-rc1/drivers/char/wdt977.c Fri Sep 7 11:28:38 2001
+++ linux/drivers/char/wdt977.c Fri Dec 14 16:15:45 2001
@@ -1,5 +1,5 @@
/*
- * Wdt977 0.01: A Watchdog Device for Netwinder W83977AF chip
+ * Wdt977 0.02: A Watchdog Device for Netwinder W83977AF chip
*
* (c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>)
*
@@ -11,6 +11,8 @@
* 2 of the License, or (at your option) any later version.
*
* -----------------------
+ * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*/

#include <linux/module.h>
@@ -32,6 +34,16 @@ static int timeout = 3;
static int timer_alive;
static int testmode;

+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+
/*
* Allow only one person to hold it open
*/
@@ -40,9 +52,9 @@ static int wdt977_open(struct inode *ino
{
if(timer_alive)
return -EBUSY;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
MOD_INC_USE_COUNT;
-#endif
+ }
timer_alive++;

//max timeout value = 255 minutes (0xFF). Write 0 to disable WatchDog.
@@ -89,9 +101,9 @@ static int wdt977_release(struct inode *
{
/*
* Shut off the timer.
- * Lock it in if it's a module and we defined ...NOWAYOUT
+ * Lock it in if it's a module and we set nowayout
*/
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
lock_kernel();

// unlock the SuperIO chip
@@ -127,7 +139,7 @@ static int wdt977_release(struct inode *
unlock_kernel();

printk(KERN_INFO "Watchdog: shutdown.\n");
-#endif
+ }
return 0;
}

diff -burNp --exclude-from=/home/mdomsch/excludes linux-2.4.17-rc1/drivers/char/wdt_pci.c linux/drivers/char/wdt_pci.c
--- linux-2.4.17-rc1/drivers/char/wdt_pci.c Fri Sep 7 11:28:38 2001
+++ linux/drivers/char/wdt_pci.c Mon Dec 17 11:37:08 2001
@@ -15,7 +15,7 @@
*
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
*
- * Release 0.08.
+ * Release 0.09.
*
* Fixes
* Dave Gregorich : Modularisation and minor bugs
@@ -30,6 +30,7 @@
* Alan Cox : Split ISA and PCI cards into two drivers
* Jeff Garzik : PCI cleanups
* Tigran Aivazian : Restructured wdtpci_init_one() to handle failures
+ * Matt Domsch : added nowayout and timeout module options
*/

#include <linux/config.h>
@@ -83,6 +84,26 @@ static int irq=11;

#define WD_TIMO (100*60) /* 1 minute */

+static int timeout_val = WD_TIMO; /* value passed to card */
+static int timeout = 60; /* in seconds */
+MODULE_PARM(timeout,"i");
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default=60)");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+MODULE_PARM(nowayout,"i");
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+
+static void __init
+wdtpci_validate_timeout(void)
+{
+ timeout_val = timeout * 100;
+}
+
#ifndef MODULE

/**
@@ -232,7 +253,7 @@ static void wdtpci_ping(void)
/* Write a watchdog value */
inb_p(WDT_DC);
wdtpci_ctr_mode(1,2);
- wdtpci_ctr_load(1,WD_TIMO); /* Timeout */
+ wdtpci_ctr_load(1,timeout_val); /* Timeout */
outb_p(0, WDT_DC);
}

@@ -355,9 +376,9 @@ static int wdtpci_open(struct inode *ino
case WATCHDOG_MINOR:
if(wdt_is_open)
return -EBUSY;
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
+ if (nowayout) {
MOD_INC_USE_COUNT;
-#endif
+ }
/*
* Activate
*/
@@ -385,7 +406,7 @@ static int wdtpci_open(struct inode *ino
wdtpci_ctr_mode(1,2);
wdtpci_ctr_mode(2,1);
wdtpci_ctr_load(0,20833); /* count at 100Hz */
- wdtpci_ctr_load(1,WD_TIMO);/* Timeout 60 seconds */
+ wdtpci_ctr_load(1,timeout_val); /* Timeout */
/* DO NOT LOAD CTR2 on PCI card! -- JPN */
outb_p(0, WDT_DC); /* Enable */
return 0;
@@ -413,10 +434,10 @@ static int wdtpci_release(struct inode *
if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
{
lock_kernel();
-#ifndef CONFIG_WATCHDOG_NOWAYOUT
+ if (!nowayout) {
inb_p(WDT_DC); /* Disable counters */
wdtpci_ctr_load(2,0); /* 0 length reset pulses now */
-#endif
+ }
wdt_is_open=0;
unlock_kernel();
}
@@ -620,6 +641,8 @@ static int __init wdtpci_init(void)
if (rc < 1)
return -ENODEV;

+ wdtpci_validate_timeout();
+
return 0;
}

-
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