This is a note to let you know that I've just added the patch titled
watchdog: iTCO_wdt: Account for rebooting on second timeout
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
watchdog-itco_wdt-account-for-rebooting-on-second-ti.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6ab74fbe296adaf7e091266ed09fc5c226626727
Author: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Date: Sun May 30 13:24:23 2021 +0200
watchdog: iTCO_wdt: Account for rebooting on second timeout
[ Upstream commit cb011044e34c293e139570ce5c01aed66a34345c ]
This was already attempted to fix via 1fccb73011ea: If the BIOS did not
enable TCO SMIs, the timer definitely needs to trigger twice in order to
cause a reboot. If TCO SMIs are on, as well as SMIs in general, we can
continue to assume that the BIOS will perform a reboot on the first
timeout.
QEMU with its ICH9 and related BIOS falls into the former category,
currently taking twice the configured timeout in order to reboot the
machine. For iTCO version that fall under turn_SMI_watchdog_clear_off,
this is also true and was currently only addressed for v1, irrespective
of the turn_SMI_watchdog_clear_off value.
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/0b8bb307-d08b-41b5-696c-305cdac6789c@xxxxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
index e707c4797f76..08e534fba1bf 100644
--- a/drivers/watchdog/iTCO_wdt.c
+++ b/drivers/watchdog/iTCO_wdt.c
@@ -72,6 +72,8 @@
#define TCOBASE(p) ((p)->tco_res->start)
/* SMI Control and Enable Register */
#define SMI_EN(p) ((p)->smi_res->start)
+#define TCO_EN (1 << 13)
+#define GBL_SMI_EN (1 << 0)
#define TCO_RLD(p) (TCOBASE(p) + 0x00) /* TCO Timer Reload/Curr. Value */
#define TCOv1_TMR(p) (TCOBASE(p) + 0x01) /* TCOv1 Timer Initial Value*/
@@ -344,8 +346,12 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
tmrval = seconds_to_ticks(p, t);
- /* For TCO v1 the timer counts down twice before rebooting */
- if (p->iTCO_version == 1)
+ /*
+ * If TCO SMIs are off, the timer counts down twice before rebooting.
+ * Otherwise, the BIOS generally reboots when the SMI triggers.
+ */
+ if (p->smi_res &&
+ (SMI_EN(p) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN))
tmrval /= 2;
/* from the specs: */
@@ -510,7 +516,7 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
* Disables TCO logic generating an SMI#
*/
val32 = inl(SMI_EN(p));
- val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
+ val32 &= ~TCO_EN; /* Turn off SMI clearing watchdog */
outl(val32, SMI_EN(p));
}
