* [PATCH] watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running
@ 2022-10-28 6:27 Mika Westerberg
2022-10-28 7:12 ` Guenter Roeck
2022-10-28 8:21 ` Daniel P. Berrangé
0 siblings, 2 replies; 3+ messages in thread
From: Mika Westerberg @ 2022-10-28 6:27 UTC (permalink / raw)
To: Wim Van Sebroeck, Guenter Roeck; +Cc: berrange, Mika Westerberg, linux-watchdog
Daniel reported that the commit 1ae3e78c0820 ("watchdog: iTCO_wdt: No
need to stop the timer in probe") makes QEMU implementation of the iTCO
watchdog not to trigger reboot anymore when NO_REBOOT flag is initially
cleared using this option (in QEMU command line):
-global ICH9-LPC.noreboot=false
The problem with the commit is that it left the unconditional setting of
NO_REBOOT that is not cleared anymore when the kernel keeps pinging the
watchdog (as opposed to the previous code that called iTCO_wdt_stop()
that cleared it).
Fix this so that we only set NO_REBOOT if the watchdog was not initially
running.
Fixes: 1ae3e78c0820 ("watchdog: iTCO_wdt: No need to stop the timer in probe")
Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
Hi,
I tested this with the command line Daniel provided:
-watchdog-action poweroff \
-global ICH9-LPC.noreboot=false
With the patch QEMU shuts down after ~60s and without it keeps running.
drivers/watchdog/iTCO_wdt.c | 21 ++++++++++++++-------
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
index 34693f11385f..e937b4dd28be 100644
--- a/drivers/watchdog/iTCO_wdt.c
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -423,14 +423,18 @@ static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
return time_left;
}
-static void iTCO_wdt_set_running(struct iTCO_wdt_private *p)
+/* Returns true if the watchdog was running */
+static bool iTCO_wdt_set_running(struct iTCO_wdt_private *p)
{
u16 val;
- /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is * enabled */
+ /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled */
val = inw(TCO1_CNT(p));
- if (!(val & BIT(11)))
+ if (!(val & BIT(11))) {
set_bit(WDOG_HW_RUNNING, &p->wddev.status);
+ return true;
+ }
+ return false;
}
/*
@@ -518,9 +522,6 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
return -ENODEV; /* Cannot reset NO_REBOOT bit */
}
- /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
- p->update_no_reboot_bit(p->no_reboot_priv, true);
-
if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
/*
* Bit 13: TCO_EN -> 0
@@ -572,7 +573,13 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
watchdog_set_drvdata(&p->wddev, p);
platform_set_drvdata(pdev, p);
- iTCO_wdt_set_running(p);
+ if (!iTCO_wdt_set_running(p)) {
+ /*
+ * If the watchdog was not running set NO_REBOOT now to
+ * prevent later reboots.
+ */
+ p->update_no_reboot_bit(p->no_reboot_priv, true);
+ }
/* Check that the heartbeat value is within it's range;
if not reset to the default */
--
2.35.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running
2022-10-28 6:27 [PATCH] watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running Mika Westerberg
@ 2022-10-28 7:12 ` Guenter Roeck
2022-10-28 8:21 ` Daniel P. Berrangé
1 sibling, 0 replies; 3+ messages in thread
From: Guenter Roeck @ 2022-10-28 7:12 UTC (permalink / raw)
To: Mika Westerberg, Wim Van Sebroeck; +Cc: berrange, linux-watchdog
On 10/27/22 23:27, Mika Westerberg wrote:
> Daniel reported that the commit 1ae3e78c0820 ("watchdog: iTCO_wdt: No
> need to stop the timer in probe") makes QEMU implementation of the iTCO
> watchdog not to trigger reboot anymore when NO_REBOOT flag is initially
> cleared using this option (in QEMU command line):
>
> -global ICH9-LPC.noreboot=false
>
> The problem with the commit is that it left the unconditional setting of
> NO_REBOOT that is not cleared anymore when the kernel keeps pinging the
> watchdog (as opposed to the previous code that called iTCO_wdt_stop()
> that cleared it).
>
> Fix this so that we only set NO_REBOOT if the watchdog was not initially
> running.
>
> Fixes: 1ae3e78c0820 ("watchdog: iTCO_wdt: No need to stop the timer in probe")
> Reported-by: Daniel P. Berrangé <berrange@redhat.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
> ---
> Hi,
>
> I tested this with the command line Daniel provided:
>
> -watchdog-action poweroff \
> -global ICH9-LPC.noreboot=false
>
> With the patch QEMU shuts down after ~60s and without it keeps running.
>
> drivers/watchdog/iTCO_wdt.c | 21 ++++++++++++++-------
> 1 file changed, 14 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> index 34693f11385f..e937b4dd28be 100644
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -423,14 +423,18 @@ static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev)
> return time_left;
> }
>
> -static void iTCO_wdt_set_running(struct iTCO_wdt_private *p)
> +/* Returns true if the watchdog was running */
> +static bool iTCO_wdt_set_running(struct iTCO_wdt_private *p)
> {
> u16 val;
>
> - /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is * enabled */
> + /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled */
> val = inw(TCO1_CNT(p));
> - if (!(val & BIT(11)))
> + if (!(val & BIT(11))) {
> set_bit(WDOG_HW_RUNNING, &p->wddev.status);
> + return true;
> + }
> + return false;
> }
>
> /*
> @@ -518,9 +522,6 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
> return -ENODEV; /* Cannot reset NO_REBOOT bit */
> }
>
> - /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
> - p->update_no_reboot_bit(p->no_reboot_priv, true);
> -
> if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
> /*
> * Bit 13: TCO_EN -> 0
> @@ -572,7 +573,13 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
> watchdog_set_drvdata(&p->wddev, p);
> platform_set_drvdata(pdev, p);
>
> - iTCO_wdt_set_running(p);
> + if (!iTCO_wdt_set_running(p)) {
> + /*
> + * If the watchdog was not running set NO_REBOOT now to
> + * prevent later reboots.
> + */
> + p->update_no_reboot_bit(p->no_reboot_priv, true);
> + }
>
> /* Check that the heartbeat value is within it's range;
> if not reset to the default */
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running
2022-10-28 6:27 [PATCH] watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running Mika Westerberg
2022-10-28 7:12 ` Guenter Roeck
@ 2022-10-28 8:21 ` Daniel P. Berrangé
1 sibling, 0 replies; 3+ messages in thread
From: Daniel P. Berrangé @ 2022-10-28 8:21 UTC (permalink / raw)
To: Mika Westerberg; +Cc: Wim Van Sebroeck, Guenter Roeck, linux-watchdog
On Fri, Oct 28, 2022 at 09:27:50AM +0300, Mika Westerberg wrote:
> Daniel reported that the commit 1ae3e78c0820 ("watchdog: iTCO_wdt: No
> need to stop the timer in probe") makes QEMU implementation of the iTCO
> watchdog not to trigger reboot anymore when NO_REBOOT flag is initially
> cleared using this option (in QEMU command line):
>
> -global ICH9-LPC.noreboot=false
>
> The problem with the commit is that it left the unconditional setting of
> NO_REBOOT that is not cleared anymore when the kernel keeps pinging the
> watchdog (as opposed to the previous code that called iTCO_wdt_stop()
> that cleared it).
>
> Fix this so that we only set NO_REBOOT if the watchdog was not initially
> running.
>
> Fixes: 1ae3e78c0820 ("watchdog: iTCO_wdt: No need to stop the timer in probe")
> Reported-by: Daniel P. Berrangé <berrange@redhat.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
With regards,
Daniel
--
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-10-28 6:27 [PATCH] watchdog: iTCO_wdt: Set NO_REBOOT if the watchdog is not already running Mika Westerberg
2022-10-28 7:12 ` Guenter Roeck
2022-10-28 8:21 ` Daniel P. Berrangé
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